title: Convert String of letters to numbers according to ordinal value?
body: <p>I have no idea where to start with this. I need to write a function that will return a string of numbers in ordinal value. So like</p>
  
  <pre><code>stringConvert('DABC')
  </code></pre>
  
  <p>would give me <code>'4123'</code></p>
  
  <pre><code>stringConvert('XPFT')
  </code></pre>
  
  <p>would give me <code>'4213'</code></p>
  
  <p>I thought maybe I could make a dictionary and make the each letter from the string associate it with an integer, but that seems too inefficient and I still don't know how to put them in order.</p>