title: While loop for alphabet
body: <p>I am trying to code the following example.</p>
  
  <pre><code>Input  ABCDEFGHIJKLMNOPQRSTUVWXYZ
  
  Output  ZYXWVUTSRQPONMLKJIHGFEDCBA
  </code></pre>
  
  <p>If user types in <code>A</code> it will output <code>Z</code>.  It has to go past 25 characters to reach <code>Z</code>. So I am guessing a while loop will be needed, then if <code>B</code> it has to go through 23 times, so – 2 and so on until it reaches <code>M</code> as it will skip though 1 to reach <code>N</code>, then start again at 25.</p>
  
  <p>Any suggestion on how to approach this?</p>