title: Append input to list as integers
body: <p>If a user inputs three numbers separated by a space, how can I append them to a list as integers?</p>
  
  <p>For example:</p>
  
  <pre><code>Enter vector A:
  1 3 2
  Enter vector B:
  2 3 0
  </code></pre>
  
  <p>I'm sure str.split is required...</p>