title: Print each word in string using index slicing
body: <p>I want to print each word in <code>word = "They stumble who run fast"</code> on a new line using index slicing.</p>
  
  <p>I've tried using a <code>while</code> loop, like printing words after each space</p>
  
  <pre><code>word = "They stumble who run fast"
  space = word.count(' ')
  start = 0
  while space != -1:
     print(word[start:space])
  </code></pre>
  
  <p>The result should be like this:</p>
  
  <pre><code>They
  stumble
  who
  run
  fast
  </code></pre>