input: 
  def print_alphabet_order(strings: List[str]) -> None:
      """ Given a list of strings, print each string in alphabetical order.
      >>> print_alphabet_order(['cat', 'dog', 'apple', 'banana'])
      apple
      banana
      cat
      dog
      """
      strings.sort()
      for string in strings:
          print(string)
  
output:     strings.sort()
      for string in strings:
          print(string)