input: def sort_words(words: List[str]) -> None:
      """ Takes a list of strings and prints them in alphabetical order.
      >>> sort_words(['cat', 'dog', 'apple', 'banana'])
      apple
      banana
      cat
      dog
      """
      words.sort()
      for word in words:
          print(word)
output:     words.sort()
      for word in words:
          print(word)