title: Capitalize first letter of each numbered line
body: <p>I can't figure out how to skip the numbers (ex. 1., 2., 3.). I am not supposed to modify the string, but still need to capitalize all the first letter of each line (ignoring the numbers). Perhaps I could use <code>each_line</code> and <code>sub</code>, maybe <code>match</code> method.</p>
  
  <pre><code>1.     i was just doing this problem.
  2. also eating so much food.
  3.     it was nice listening to the Mahler.
  </code></pre>
  
  <p>To</p>
  
  <pre><code>1.     I was just doing this problem.
  2. Also eating so much food.
  3.     It was nice listening to the Mahler.
  </code></pre>