title: Perl Module to convert numbers to letter notation
body: <p>Is there a perl module that will convert a number to a letter and vice versa?</p>
  
  <p>For instance </p>
  
  <pre><code>1 = A 
  2 = B
  3 = C
  ...
  27 = AA
  28 = AB
  29 = AC
  ...
  53 = BA
  54 = BB
  55 = BC
  </code></pre>
  
  <p>So on and so forth.</p>