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Program 3
<html>
 <head>
 [
  (inputs word) ; HTML input.  Will be null if no such input.
  (define newword
    (if (null? word)
        "something"
        word))
 ]
  <title>Backwards</title>
 </head>
 
 <body>
  <form>
  Type a word: <input name="word">
  <input type="Submit">
  </form>
  
  <p>[newword] spelled backwards is
     [(list->string (reverse (string->list newword)))]
  </p>
  
  <p>This message brought to you by [(cgi SERVER_NAME)] as a public
  service.</p>
  
 </body>
</html>