title: Code Golf: Numeric equivalent of an Excel column name
body: <h2>The challenge</h2>
  <p>The shortest code by character count that will output the numeric equivalent of an Excel column string.</p>
  <p>For example, the <code>A</code> column is 1, <code>B</code> is 2, so on and so forth. Once you hit <code>Z</code>, the next column becomes <code>AA</code>, then <code>AB</code> and so on.</p>
  <h2>Test cases:</h2>
  <pre><code>A:    1
  B:    2
  AD:   30
  ABC:  731
  WTF:  16074
  ROFL: 326676
  </code></pre>
  <p>Code count includes input/output (i.e full program).</p>