input: def combine_and_reverse(word1: str, word2: str) -> str:
      """ Combines two strings and returns the result in reverse order.
      >>> combine_and_reverse("Hello ", "world!")
      '!dlrow olleH'
      >>> combine_and_reverse("Python", " is fun!")
      '!nuf si nohtyP'
      """
output:     combined = word1 + word2
      return combined[::-1]