title: str.find() outputs '-1' when given a list
body: <p>I'm trying to find the position of the first vowel in a word but it keeps outputting '-1'.  When I change <code>aLow = word.find(vowel)</code> to <code>aLow = word.find("a")</code>, it works correctly.</p>
  
  <pre><code>vowels = ['a','e','i','o','u']
  
  while True:
      letters = []
      pGWord = ""
  
      word = raw_input("Type word to 'Pig Latin' it: ")
      low = len(word)
  
      for vowel in vowels:
          aLow = word.find(vowel)
          if aLow &lt; low:
              low = aLow
  
      print low
  </code></pre>