blocks|key|5782397|text|JavaScript+(ES6)+122|type|header-two|depth|inlineStyleRanges|entityRanges|data|5782398|f=s=>/[%5Ea-z+]/i.test(s)?"Sentence+must+only+use+letters":s.split(/+%2B/).map((w,i)=>~-i&2?w:[...w].reverse().join``).join`+`

alert(f(prompt('?','She+sells+Sea+shells+on+the+Sea+shore')))|code-block|syntax|javascript|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|I|8|@]|9|@]|A|$E|F]]]|G|$]]

<h1>JavaScript (ES6) 122</h1>

<p><div class="snippet" data-lang="js" data-hide="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>f=s=&gt;/[^a-z ]/i.test(s)?"Sentence must only use letters":s.split(/ +/).map((w,i)=&gt;~-i&amp;2?w:[...w].reverse().join``).join` `

alert(f(prompt('?','She sells Sea shells on the Sea shore')))</code></pre>
</div>
</div>
</p>


blocks|key|349544|text|Pyth，61字节|type|header-two|depth|inlineStyleRanges|entityRanges|data|349545|?.A}R%2BG\+rz0jd.e_W%25%25k4+3bfTczd"Sentence+must+only+use+letters|code-block|syntax|javascript|349546|在网上试试。|unstyled|offset|length|entityMap|0|LINK|mutability|MUTABLE|url|https://pyth.herokuapp.com/?code=%253F.A%257DR%252BG%255C%2520rz0jd.e_W%2525%2525k4%25203bfTczd%2522Sentence%2520must%2520only%2520use%2520letters&input=She%2Bsells%2BSea%2Bshells%2Bon%2Bthe%2BSea%2Bshore^0|0|0|0|6|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|I|7|U|8|@]|9|@$J|V|K|W|1|X]]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

<h1>Pyth, 61 bytes</h1>
<pre><code>?.A}R+G\ rz0jd.e_W%%k4 3bfTczd&quot;Sentence must only use letters
</code></pre>
<p><a href="https://pyth.herokuapp.com/?code=%3F.A%7DR%2BG%5C%20rz0jd.e_W%25%25k4%203bfTczd%22Sentence%20must%20only%20use%20letters&amp;input=She+sells+Sea+shells+on+the+Sea+shore" rel="nofollow noreferrer">Try it online.</a></p>


blocks|key|349630|text|Pyth，72|type|header-two|depth|inlineStyleRanges|entityRanges|data|349631|=zflTc?:z"[%5EA-Za-z+]"0"Sentence+tsum+ylno+use+letters"zdjd.e?%25/hk2+2_bbz|code-block|syntax|javascript|349632|并不能胜过另一个Pyth的答案，但我已经投入了时间去写它。这基本上是我的Python回答的翻译。|unstyled|offset|length|349633|在网上试试|entityMap|0|LINK|mutability|MUTABLE|url|https://codegolf.stackexchange.com/a/62324/34787|1|https://pyth.herokuapp.com/?code=%253DzflTc%253F%253Az%2522%255B%255EA-Za-z%2B%255D%25220%2522Sentence%2Btsum%2Bylno%2Buse%2Bletters%2522zdjd.e%253F%2525%252Fhk2%2B2_bbz&input=She%2Bsells%2Bsea%2Bshells%2Bby%2Bthe%2Bsea%2Bshore&test_suite=1&test_suite_input=She%2Bsells%2Bsea%2Bshells%2Bby%2Bthe%2Bsea%2Bshore&debug=0^0|0|0|10|8|0|0|0|5|1^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|I|7|Y|8|@]|9|@$J|Z|K|10|1|11]]|A|$]]|$1|L|3|M|5|I|7|12|8|@]|9|@$J|13|K|14|1|15]]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]|U|$5|P|Q|R|A|$S|V]]]]

<h1>Pyth, 72</h1>
<pre><code>=zflTc?:z&quot;[^A-Za-z ]&quot;0&quot;Sentence tsum ylno use letters&quot;zdjd.e?%/hk2 2_bbz
</code></pre>
<p>Doesn't beat the other Pyth answer, but I already invested time into writing it. It's basically a translation of my <a href="https://codegolf.stackexchange.com/a/62324/34787">Python answer</a>.</p>
<p><a href="https://pyth.herokuapp.com/?code=%3DzflTc%3F%3Az%22%5B%5EA-Za-z+%5D%220%22Sentence+tsum+ylno+use+letters%22zdjd.e%3F%25%2Fhk2+2_bbz&amp;input=She+sells+sea+shells+by+the+sea+shore&amp;test_suite=1&amp;test_suite_input=She+sells+sea+shells+by+the+sea+shore&amp;debug=0" rel="nofollow noreferrer">Try it online</a></p>


blocks|key|5782456|text|Julia，109个字节|type|header-two|depth|inlineStyleRanges|entityRanges|data|5782457|s->(i=0;join([isalpha(w)?(i%2B=1)%254>1?reverse(w):w:error("Sentence+must+only+use+letters")for+w=split(s)],"+"))|code-block|syntax|javascript|5782458|i=0和(i%2B=1)%254>1用于决定每个单词是否得到reversed。isalpha应用于拆分后的单词，使用split(s)来确定是否有字符不是字母(空格已经被移除)。join在操作后还原字符串，除非抛出error。|unstyled|offset|length|style|CODE|entityMap^0|0|0|0|3|4|A|Q|7|Z|7|1I|8|2C|4|2U|5^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|I|7|Q|8|@$J|R|K|S|L|M]|$J|T|K|U|L|M]|$J|V|K|W|L|M]|$J|X|K|Y|L|M]|$J|Z|K|10|L|M]|$J|11|K|12|L|M]|$J|13|K|14|L|M]]|9|@]|A|$]]]|N|$]]

<h1>Julia, 109 bytes</h1>

<pre><code>s-&gt;(i=0;join([isalpha(w)?(i+=1)%4&gt;1?reverse(w):w:error("Sentence must only use letters")for w=split(s)]," "))
</code></pre>

<p><code>i=0</code> and <code>(i+=1)%4&gt;1</code> are used to decide whether each word gets <code>reverse</code>d or not. <code>isalpha</code> applies to the words after being split using <code>split(s)</code> to determine whether or not there are characters that aren't letters (spaces have already been removed by this point). <code>join</code> restores the string after the manipulation, unless the <code>error</code> is thrown.</p>


blocks|key|5782574|text|Pyth，55字节|type|header-two|depth|inlineStyleRanges|entityRanges|data|5782575|?--rz0Gd"Sentence+must+only+use+letters"jd.e_W%25%25k4+3bcz|code-block|syntax|javascript|5782576|从%25%25k4+3中借用了Pietu1998的位。保存了一个额外的字节。|unstyled|offset|length|style|CODE|5782577|在线试用：游行示威或测试套房|5782578|解释|5782579|?--rz0Gd"..."jd.e_W%25%25k4+3bcz+++implicit:+z+=+input+string
+++rz0+++++++++++++++++++++++++convert+z+to+lower-case
++-+++G++++++++++++++++++++++++remove+all+letters
+-+++++d+++++++++++++++++++++++remove+all+spaces
?++++++++++++++++++++++++++++++if+there+is+some+chars+left+than
++++++++"..."++++++++++++++++++++print+the+string+"Sentence+must+only+..."
+++++++++++++++++++++++++++++++else:
++++++++++++++++++++++++++cz+++++split+z+by+spaces+or+multiple+spaces
+++++++++++++++.e++++++++++++++++map+each+pair+(k+index,+b+string)+of+%5E+to:+
+++++++++++++++++_+++++++b++++++++++b+or+reversed+of+b,+depending+on
++++++++++++++++++W%25%25k4+3+++++++++++(k+mod+4)+mod+3
+++++++++++++jd++++++++++++++++++join+the+result+by+spaces|entityMap|0|LINK|mutability|MUTABLE|url|http://pyth.herokuapp.com/?test_suite_input=She%2520sells%2520Sea%2520shells%2520on%2520the%2520Sea%2520shore%250AProgramming%2520%2520%2520Puzzles%2520and%2520%2520%2520Code%2520Golf%250AI%2527m%2520here%2520to%2520help&input=She%2520sells%2520Sea%2520shells%2520on%2520the%2520Sea%2520shore&test_suite=0&code=%253F--rz0Gd%2522Sentence%2520must%2520only%2520use%2520letters%2522jd.e_W%2525%2525k4%25203bcz|1|http://pyth.herokuapp.com/?test_suite_input=She%2520sells%2520Sea%2520shells%2520on%2520the%2520Sea%2520shore%250AProgramming%2520%2520%2520Puzzles%2520and%2520%2520%2520Code%2520Golf%250AI%2527m%2520here%2520to%2520help&input=She%2520sells%2520Sea%2520shells%2520on%2520the%2520Sea%2520shore&test_suite=1&code=%253F--rz0Gd%2522Sentence%2520must%2520only%2520use%2520letters%2522jd.e_W%2525%2525k4%25203bcz^0|0|0|1|6|0|5|4|0|A|4|1|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|13|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|I|7|14|8|@$J|15|K|16|L|M]]|9|@]|A|$]]|$1|N|3|O|5|I|7|17|8|@]|9|@$J|18|K|19|1|1A]|$J|1B|K|1C|1|1D]]|A|$]]|$1|P|3|Q|5|6|7|1E|8|@]|9|@]|A|$]]|$1|R|3|S|5|D|7|1F|8|@]|9|@]|A|$E|F]]]|T|$U|$5|V|W|X|A|$Y|Z]]|10|$5|V|W|X|A|$Y|11]]]]

<h1>Pyth, 55 bytes</h1>

<pre><code>?--rz0Gd"Sentence must only use letters"jd.e_W%%k4 3bcz
</code></pre>

<p>Borrowed the <code>%%k4 3</code> bit from Pietu1998. Saved one additional byte. </p>

<p>Try it online: <a href="http://pyth.herokuapp.com/?test_suite_input=She%20sells%20Sea%20shells%20on%20the%20Sea%20shore%0AProgramming%20%20%20Puzzles%20and%20%20%20Code%20Golf%0AI%27m%20here%20to%20help&amp;input=She%20sells%20Sea%20shells%20on%20the%20Sea%20shore&amp;test_suite=0&amp;code=%3F--rz0Gd%22Sentence%20must%20only%20use%20letters%22jd.e_W%25%25k4%203bcz" rel="nofollow">Demonstration</a> or <a href="http://pyth.herokuapp.com/?test_suite_input=She%20sells%20Sea%20shells%20on%20the%20Sea%20shore%0AProgramming%20%20%20Puzzles%20and%20%20%20Code%20Golf%0AI%27m%20here%20to%20help&amp;input=She%20sells%20Sea%20shells%20on%20the%20Sea%20shore&amp;test_suite=1&amp;code=%3F--rz0Gd%22Sentence%20must%20only%20use%20letters%22jd.e_W%25%25k4%203bcz" rel="nofollow">Test Suite</a></p>

<h3>Explanation</h3>

<pre><code>?--rz0Gd"..."jd.e_W%%k4 3bcz   implicit: z = input string
   rz0                         convert z to lower-case
  -   G                        remove all letters
 -     d                       remove all spaces
?                              if there is some chars left than
        "..."                    print the string "Sentence must only ..."
                               else:
                          cz     split z by spaces or multiple spaces
               .e                map each pair (k index, b string) of ^ to: 
                 _       b          b or reversed of b, depending on
                  W%%k4 3           (k mod 4) mod 3
             jd                  join the result by spaces
</code></pre>


blocks|key|349835|text|杰夫特+v2.0a0+-S，41字节|type|header-two|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|349836|¸¬è\L+?`SÀZn­+Û+§+«e+Ò5s`:UeS²S+¸ËzEc2|code-block|syntax|javascript|349837|试试看|unstyled|349838|¸¬è\L+?`...`:UeS²S+¸ËzEc2+++++:Implicit+input+of+string+U
¸+++++++++++++++++++++++++++++:Split+on+spaces
+¬++++++++++++++++++++++++++++:Join
++è+++++++++++++++++++++++++++:Count+occurrences+of
+++\L+++++++++++++++++++++++++:RegEx+/[%5EA-Z]/gi
++++++?`...`:+++++++++++++++++:If+truthy+return+the+compressed+string+"Sentence+must+only+use+letters",+else
+++++++++++++Ue+++++++++++++++:Recursively+replace+in+U
+++++++++++++++S²S++++++++++++:++Two+spaces+with+one
+++++++++++++++++++¸++++++++++:Split+on+spaces
++++++++++++++++++++Ë+++++++++:Map+each+element+at+0-based+index+E
+++++++++++++++++++++z++++++++:++Rotate+clockwise+by+90+degrees+multiplied+by
++++++++++++++++++++++Ec2+++++:++++E+rounded+up+to+the+nearest+multiple+of+2
++++++++++++++++++++++++++++++:Implicit+output,+joined+with+spaces|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/ETHproductions/japt|1|https://codegolf.meta.stackexchange.com/a/14339/|2|https://petershaggynoble.github.io/Japt-Interpreter/?v=2.0a0&flags=LVM&code=uKzoXEwgP2BTwFpurSDbGSCNpyCrZSDSNYBzYDpVZVOyUyC4y3pFYzI&input=IlByb2dyYW1taW5nICAgUHV6emxlcyBhbmQgICBDb2RlIEdvbGYi^0|B|2|0|3|0|B|2|1|0|0|0|3|2|0^^$0|@$1|2|3|4|5|6|7|10|8|@$9|11|A|12|B|C]]|D|@$9|13|A|14|1|15]|$9|16|A|17|1|18]]|E|$]]|$1|F|3|G|5|H|7|19|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|M|7|1A|8|@]|D|@$9|1B|A|1C|1|1D]]|E|$]]|$1|N|3|O|5|H|7|1E|8|@]|D|@]|E|$I|J]]]|P|$Q|$5|R|S|T|E|$U|V]]|W|$5|R|S|T|E|$U|X]]|Y|$5|R|S|T|E|$U|Z]]]]

<h1><a href="https://github.com/ETHproductions/japt" rel="nofollow noreferrer">Japt</a> v2.0a0 <a href="https://codegolf.meta.stackexchange.com/a/14339/"><code>-S</code></a>, 41 bytes</h1>
<pre><code>¸¬è\L ?`SÀZn­ Û § «e Ò5s`:UeS²S ¸ËzEc2
</code></pre>
<p><a href="https://petershaggynoble.github.io/Japt-Interpreter/?v=2.0a0&amp;flags=LVM&amp;code=uKzoXEwgP2BTwFpurSDbGSCNpyCrZSDSNYBzYDpVZVOyUyC4y3pFYzI&amp;input=IlByb2dyYW1taW5nICAgUHV6emxlcyBhbmQgICBDb2RlIEdvbGYi" rel="nofollow noreferrer">Try it</a></p>
<pre><code>¸¬è\L ?`...`:UeS²S ¸ËzEc2     :Implicit input of string U
¸                             :Split on spaces
 ¬                            :Join
  è                           :Count occurrences of
   \L                         :RegEx /[^A-Z]/gi
      ?`...`:                 :If truthy return the compressed string &quot;Sentence must only use letters&quot;, else
             Ue               :Recursively replace in U
               S²S            :  Two spaces with one
                   ¸          :Split on spaces
                    Ë         :Map each element at 0-based index E
                     z        :  Rotate clockwise by 90 degrees multiplied by
                      Ec2     :    E rounded up to the nearest multiple of 2
                              :Implicit output, joined with spaces
</code></pre>


blocks|key|5782755|text|果冻，39字节|type|header-two|depth|inlineStyleRanges|entityRanges|offset|length|data|5782756|³Ḳ¹ƇUJ2&TƲ¦K
“*[,ṛDṾȧƤ°Ġṛ©¦»
ØẠ”+ṭ³eƇ⁼£|code-block|syntax|javascript|5782757|在网上试试！|unstyled|5782758|多亏了外域高尔夫球手埃里克。他把我从几个额外的字节和许多小时的挫折中拯救出来。|5782759|这里有一个46字节的解决方案|5782760|当输入包含无效字符时，实际上会引发python语法错误。|5782761|³Ḳ¹ƇUJ2&TƲ¦K
“çỤḷṁŀDṀẠṠGmḟĖƲƑ⁽Ḳḟ»ŒV
ØẠ”+ṭ³eƇ⁼£|5782762|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/DennisMitchell/jelly|1|https://tio.run/##AYoAdf9qZWxsef//wrPhuLLCucaHVUoyJlTGssKmSwrigJwqWyzhuZtE4bm@yKfGpMKwxKDhuZvCqcKmwrsKw5jhuqDigJ0g4bmtwrNlxofigbzCo////1RoaXMgaXMgYSB0ZXN0IG9mIHRoZSBhdXRvbWF0aWMgdm9pY2UgbWVzc2FnaW5nIHN5c3RlbS4|2|https://tio.run/##AY0Acv9qZWxsef//wrPhuLLCucaHVUoyJlTGssKmSwrigJzDp@G7pOG4t@G5gcWAROG5gOG6oOG5oEdt4bifxJbGssaR4oG94biy4bifwrvFklYKw5jhuqDigJ0g4bmtwrNlxofigbzCo////1Byb2dyYW1taW5nICAgUHV6emxlcyBhbmQgICBDb2RlIEdvbGY^0|0|2|0|0|0|0|6|1|0|0|0|0|0|0|6|2^^$0|@$1|2|3|4|5|6|7|15|8|@]|9|@$A|16|B|17|1|18]]|C|$]]|$1|D|3|E|5|F|7|19|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|K|7|1A|8|@]|9|@$A|1B|B|1C|1|1D]]|C|$]]|$1|L|3|M|5|K|7|1E|8|@]|9|@]|C|$]]|$1|N|3|O|5|6|7|1F|8|@]|9|@]|C|$]]|$1|P|3|Q|5|K|7|1G|8|@]|9|@]|C|$]]|$1|R|3|S|5|F|7|1H|8|@]|9|@]|C|$G|H]]|$1|T|3|J|5|K|7|1I|8|@]|9|@$A|1J|B|1K|1|1L]]|C|$]]]|U|$V|$5|W|X|Y|C|$Z|10]]|11|$5|W|X|Y|C|$Z|12]]|13|$5|W|X|Y|C|$Z|14]]]]

<h1><a href="https://github.com/DennisMitchell/jelly" rel="nofollow noreferrer">Jelly</a>, 39 bytes</h1>

<pre><code>³Ḳ¹ƇUJ2&amp;TƲ¦K
“*[,ṛDṾȧƤ°Ġṛ©¦»
ØẠ” ṭ³eƇ⁼£
</code></pre>

<p><a href="https://tio.run/##AYoAdf9qZWxsef//wrPhuLLCucaHVUoyJlTGssKmSwrigJwqWyzhuZtE4bm@yKfGpMKwxKDhuZvCqcKmwrsKw5jhuqDigJ0g4bmtwrNlxofigbzCo////1RoaXMgaXMgYSB0ZXN0IG9mIHRoZSBhdXRvbWF0aWMgdm9pY2UgbWVzc2FnaW5nIHN5c3RlbS4" rel="nofollow noreferrer" title="Jelly – Try It Online">Try it online!</a></p>

<p>Thanks to Erik the Outgolfer. He saved me from a few extra bytes and from many hours of frustration.</p>

<h3>Here's a 46 byte solution</h3>

<p>It actually throws a python syntax error when the input contains invalid characters.</p>

<pre><code>³Ḳ¹ƇUJ2&amp;TƲ¦K
“çỤḷṁŀDṀẠṠGmḟĖƲƑ⁽Ḳḟ»ŒV
ØẠ” ṭ³eƇ⁼£
</code></pre>

<p><a href="https://tio.run/##AY0Acv9qZWxsef//wrPhuLLCucaHVUoyJlTGssKmSwrigJzDp@G7pOG4t@G5gcWAROG5gOG6oOG5oEdt4bifxJbGssaR4oG94biy4bifwrvFklYKw5jhuqDigJ0g4bmtwrNlxofigbzCo////1Byb2dyYW1taW5nICAgUHV6emxlcyBhbmQgICBDb2RlIEdvbGY" rel="nofollow noreferrer" title="Jelly – Try It Online">Try it online!</a></p>


blocks|key|5782876|text|Java，215个字节|type|header-two|depth|inlineStyleRanges|entityRanges|data|5782877|Regex很有趣|unstyled|5782878|s->{if(s.split("[%5Ea-zA-Z+]").length>1)throw+new+Error("Sentence+must+only+contains+letters");else{int+i=1;for(String+a:s.split("+"))System.out.print((i%2B%2B%252<1?new+StringBuffer(a).reverse():a)%2B(a.isEmpty()?"":"+"));}}|code-block|syntax|javascript|5782879|在网上试试！|offset|length|entityMap|0|LINK|mutability|MUTABLE|url|https://tio.run/##TZBBawIxEIXv/ophoZBgd8Ee3aq0oLee9laxkG4nbmw2WTKzWiv@djvVpTSXwGTe@97LzuxNvvv4vNTeEMGLceE0coExWVMjrE776D7AqoqTC1sgzU2KB4JlSjGV51HXv3tXA7Fhua7LrXgM@@uNSVvS8F90v/yqsWMXBbQCC7ML5fOTs4oK6rxjla3fTP79lL/CJtOFx7DlZj65gSHg4WajsgolZpCQbU8MMfgj1DGw0Ak8slSgTJfoCU9SCNxsUlrRDU3M9I8HmdbVkRjbIvZcdPLOSrnx@O7hcbL4Jd40z721mJTRRcK9uKPSU6PHyhSOlm3HR6UXWTa9@pXn86W0hZWYDQKh9wTDqdAANddJDPI1OExiQsk7EuEP^0|0|0|0|0|6|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$]]|$1|E|3|F|5|G|7|W|8|@]|9|@]|A|$H|I]]|$1|J|3|K|5|D|7|X|8|@]|9|@$L|Y|M|Z|1|10]]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

<h1>Java, 215 bytes</h1>

<p>Regex is fun</p>

<pre class="lang-java prettyprint-override"><code>s-&gt;{if(s.split("[^a-zA-Z ]").length&gt;1)throw new Error("Sentence must only contains letters");else{int i=1;for(String a:s.split(" "))System.out.print((i++%2&lt;1?new StringBuffer(a).reverse():a)+(a.isEmpty()?"":" "));}}
</code></pre>

<p><a href="https://tio.run/##TZBBawIxEIXv/ophoZBgd8Ee3aq0oLee9laxkG4nbmw2WTKzWiv@djvVpTSXwGTe@97LzuxNvvv4vNTeEMGLceE0coExWVMjrE776D7AqoqTC1sgzU2KB4JlSjGV51HXv3tXA7Fhua7LrXgM@@uNSVvS8F90v/yqsWMXBbQCC7ML5fOTs4oK6rxjla3fTP79lL/CJtOFx7DlZj65gSHg4WajsgolZpCQbU8MMfgj1DGw0Ak8slSgTJfoCU9SCNxsUlrRDU3M9I8HmdbVkRjbIvZcdPLOSrnx@O7hcbL4Jd40z721mJTRRcK9uKPSU6PHyhSOlm3HR6UXWTa9@pXn86W0hZWYDQKh9wTDqdAANddJDPI1OExiQsk7EuEP" rel="nofollow noreferrer">Try it online!</a></p>


blocks|key|5783079|text|05AB1E，36+字节数|type|header-two|depth|inlineStyleRanges|entityRanges|offset|length|data|5783080|ðKDáÊi“¸–ƒ—€É€Å™ê“.ªFë#áεN4%25>2÷iR]ðý|code-block|syntax|javascript|5783081|在网上试试。|unstyled|5783082|当输入不包含[A-Za-z+]时引发以下错误：|style|CODE|5783083|(RuntimeError)无法转换句子必须只使用字母为整数。|blockquote|5783084|解释：|5783085|ðK+++++++++++++++++++#+Remove+all+spaces+from+the+(implicit)+input-string
++Dá+++++++++++++++++#+Create+a+copy,+and+remove+everything+except+for+letters+from+this+copy
++++Êi+++++++++++++++#+If+the+copy+with+letters+removed+and+the+original+are+NOT+equal:
++++++“¸–ƒ—€É€Å™ê“+++#++Push+dictionary+string+"sentence+must+only+use+letters"
++++++++++++++++++.ª+#++With+sentence+capitalization
++++++F++++++++++++++#++And+try+to+loop+that+many+times,+causing+the+error+above
+++++ë+++++++++++++++#+Else:
++++++#++++++++++++++#++Split+the+(implicit)+input-string+on+spaces
+++++++á+++++++++++++#++Only+keep+letters+(which+will+remove+empty+items+caused+by+multiple
+++++++++++++++++++++#++adjacent+spaces+in+the+input,+which+is+shorter+than+`õK`)
++++++++ε++++++++++++#++Map+each+word+to:
+++++++++N4%25>2÷++++++#+++Calculate+((index+modulo-4)+%2B+1)+integer-divided+by+2
+++++++++++++++++++++#+++(results+in+0,1,1,2,0,1,1,2,0,1+for+indices+0,1,2,3,4,5,6,7,8,9)
+++++++++++++++i+++++#+++If+this+is+exactly+1:
++++++++++++++++R++++#++++Reverse+the+current+word
+++++]+++++++++++++++#+Close+the+if-statement,+map,+and+if-else+statement
++++++ðý+++++++++++++#+Join+the+modified+word-list+by+spaces
+++++++++++++++++++++#+(and+then+output+it+implicitly+as+result)|5783086|看这个05AB1E我的尖端(部分)如何使用字典？)来理解为什么“¸–ƒ—€É€Å™ê“是"sentence+must+only+use+letters"。|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/Adriandmen/05AB1E/wiki/Commands|1|https://github.com/Adriandmen/05AB1E/wiki/Codepage|2|https://tio.run/##yy9OTMpM/f//8AZvl8MLD3dlPmqYc2jHo4bJxyY9apjyqGnN4U4Q0fqoZdHhVUA5vUOr3A6vVj688NxWPxNVO6PD2zODYg9vOLz3//@Aovz0osTc3My8dAUFhYDSqqqc1GKFxLwUIM85PyVVwT0/Jw3IhgopBGekKhSn5uQUKwSnJioUZ4CZ@XkKJUBxiEh@USoA|3|https://codegolf.stackexchange.com/a/166851/52210^0|0|6|0|A|3|1|0|0|0|6|2|0|6|9|0|0|0|0|V|C|18|W|0|P|3^^$0|@$1|2|3|4|5|6|7|1B|8|@]|9|@$A|1C|B|1D|1|1E]|$A|1F|B|1G|1|1H]]|C|$]]|$1|D|3|E|5|F|7|1I|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|K|7|1J|8|@]|9|@$A|1K|B|1L|1|1M]]|C|$]]|$1|L|3|M|5|K|7|1N|8|@$A|1O|B|1P|N|O]]|9|@]|C|$]]|$1|P|3|Q|5|R|7|1Q|8|@]|9|@]|C|$]]|$1|S|3|T|5|6|7|1R|8|@]|9|@]|C|$]]|$1|U|3|V|5|F|7|1S|8|@]|9|@]|C|$G|H]]|$1|W|3|X|5|K|7|1T|8|@$A|1U|B|1V|N|O]|$A|1W|B|1X|N|O]]|9|@$A|1Y|B|1Z|1|20]]|C|$]]]|Y|$Z|$5|10|11|12|C|$13|14]]|15|$5|10|11|12|C|$13|16]]|17|$5|10|11|12|C|$13|18]]|19|$5|10|11|12|C|$13|1A]]]]

<h1><a href="https://github.com/Adriandmen/05AB1E/wiki/Commands" rel="nofollow noreferrer">05AB1E</a>, 36 <a href="https://github.com/Adriandmen/05AB1E/wiki/Codepage" rel="nofollow noreferrer">bytes</a></h1>
<pre><code>ðKDáÊi“¸–ƒ—€É€Å™ê“.ªFë#áεN4%&gt;2÷iR]ðý
</code></pre>
<p><a href="https://tio.run/##yy9OTMpM/f//8AZvl8MLD3dlPmqYc2jHo4bJxyY9apjyqGnN4U4Q0fqoZdHhVUA5vUOr3A6vVj688NxWPxNVO6PD2zODYg9vOLz3//@Aovz0osTc3My8dAUFhYDSqqqc1GKFxLwUIM85PyVVwT0/Jw3IhgopBGekKhSn5uQUKwSnJioUZ4CZ@XkKJUBxiEh@USoA" rel="nofollow noreferrer">Try it online.</a></p>
<p>Throws the following error when the input does not only contain <code>[A-Za-z ]</code>:</p>
<blockquote>
<p>(RuntimeError) Could not convert Sentence must only use letters to integer.</p>
</blockquote>
<p><strong>Explanation:</strong></p>

<pre class="lang-python prettyprint-override"><code>ðK                   # Remove all spaces from the (implicit) input-string
  Dá                 # Create a copy, and remove everything except for letters from this copy
    Êi               # If the copy with letters removed and the original are NOT equal:
      “¸–ƒ—€É€Å™ê“   #  Push dictionary string &quot;sentence must only use letters&quot;
                  .ª #  With sentence capitalization
      F              #  And try to loop that many times, causing the error above
     ë               # Else:
      #              #  Split the (implicit) input-string on spaces
       á             #  Only keep letters (which will remove empty items caused by multiple
                     #  adjacent spaces in the input, which is shorter than `õK`)
        ε            #  Map each word to:
         N4%&gt;2÷      #   Calculate ((index modulo-4) + 1) integer-divided by 2
                     #   (results in 0,1,1,2,0,1,1,2,0,1 for indices 0,1,2,3,4,5,6,7,8,9)
               i     #   If this is exactly 1:
                R    #    Reverse the current word
     ]               # Close the if-statement, map, and if-else statement
      ðý             # Join the modified word-list by spaces
                     # (and then output it implicitly as result)
</code></pre>
<p><a href="https://codegolf.stackexchange.com/a/166851/52210">See this 05AB1E tip of mine (section <em>How to use the dictionary?</em>)</a> to understand why <code>“¸–ƒ—€É€Å™ê“</code> is <code>&quot;sentence must only use letters&quot;</code>.</p>


<p><strong>Task</strong></p>

<ul>
<li>The user inputs a sentence - words only. Any input other than letters or spaces, including integers and punctuation, should throw an exception: "Sentence must only use letters".</li>
<li>The output has a pattern, where some
words are reversed and others words are normal. </li>
<li>The pattern starts as
a normal word, the next two words are reversed, then the next two
words are normal and the pattern continues. </li>
<li>An example of where the words should be normal and where words reversed is below:</li>
</ul>

<p>Normal - Reversed - Reversed - Normal - Normal - Reversed - Reversed - Normal ...</p>

<p><strong>Input Example</strong></p>

<p>She sells Sea shells on the Sea shore</p>

<p><strong>Output Example</strong></p>

<p>She slles aeS shells on eht aeS shore</p>

<p><strong>Additional Rules</strong></p>

<ul>
<li>If capital letters are used, they should remain on the letter they were originally posted on.</li>
<li>Any multiple spaces initially posted on input should be reduced to one space. For example <code>Programming   Puzzles and   Code Golf</code> becomes <code>Programming selzzuP dna Code Golf</code></li>
</ul>

<p>Shortest Code Wins!!</p>

<p>Happy coding...</p>


Code Golf: Forwards sdrawkcaB sdrawkcaB Forwards Forwards sdrawkcaB

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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任务用户只输入一个句子词.除字母或空格以外的任何输入，包括整数和标点符号，都应该抛出一个异常：“句子只能使用字母”。输出有一个模式，其中一些词是颠倒的，而另一些词是正常的。模式从一个正常单词开始，接下来的两个单词被反转，接下来的两个单词是正常的，然后这个模式继续。下面是一个例子，说明在什么地方这些词语应该是正常的，哪些词语应该相反：正常-相反-正常.输入示例她在海边卖贝壳输出示例她把aeS炮弹扔在

问代码高尔夫:转发sdrawkcaB sdrawkcaB转发sdrawkcaB
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回答 9

Code Golf用户

JavaScript (ES6) 122

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Pyth，61字节

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Pyth，72

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问代码高尔夫:转发sdrawkcaB sdrawkcaB转发sdrawkcaBEN

任务

输入示例

输出示例

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回答 9

Code Golf用户

JavaScript (ES6) 122

Code Golf用户

Pyth，61字节

Code Golf用户

Pyth，72

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