title: Only print the lowercase characters in a string
body: <p>How can I write the code so <code>python</code> ONLY prints out the <strong>lower case</strong> letters of the string. In this case, it should exclude the P.</p>
  
  <p>I tried this:</p>
  
  <pre><code>word = "Programming is fun!"
  
  for letter in word:
          if letter.lower():
          print letter
  </code></pre>
  
  <p>But it doesn't solely print out the lowercase letters. How could I only get the lower-case characters out of the string instead of the whole string in lower-case. </p>