input: def merge_lists_of_words(str1: str, str2: str) -> list:
      """
      Merge the words from two input strings and return them as a single list.
      
      >>> merge_lists_of_words("I want to make a difference", "The journey to success is long")
      ['I', 'want', 'to', 'make', 'a', 'difference', 'The', 'journey', 'to', 'success', 'is', 'long']
      >>> merge_lists_of_words("Hello world", "Python is great")
      ['Hello', 'world', 'Python', 'is', 'great']
      """
output:     words1 = str1.split()
      words2 = str2.split()
      return words1 + words2