title: How to output a string with a space between each letter
body: <p>For example, if I entered <code>I love dogs</code>, it would need to look like this:</p>
  
  <pre><code>I  l o v e  d o g s
  </code></pre>
  
  <p>This code does not do what I need it to do:</p>
  
  <pre><code>def spaceitout(source):
      pile = ""
      for letter in source:
          pile = pile+letter
          print pile
      print pile
  </code></pre>