input: from typing import List
  
  
  def modify_and_print(greetings_messages: List[str]) -> None:
      """ Modify the given list of greeting messages to 'Happy Holidays' and print each modified message 10 times.
      >>> modify_and_print(['Hello World', 'Good Morning'])
      Happy Holidays
      Happy Holidays
      Happy Holidays
      Happy Holidays
      Happy Holidays
      Happy Holidays
      Happy Holidays
      Happy Holidays
      Happy Holidays
      Happy Holidays
      Happy Holidays
      Happy Holidays
      Happy Holidays
      Happy Holidays
      Happy Holidays
      Happy Holidays
      Happy Holidays
      Happy Holidays
      Happy Holidays
      Happy Holidays
      """
      for message in greetings_messages:
          for _ in range(10):
              print('Happy Holidays')
output:     for i in range(len(greetings_messages)):
          greetings_messages[i] = 'Happy Holidays'
      for message in greetings_messages:
          for _ in range(10):
              print(message)