input: 
  def combine_and_reverse(words: str, words2: str) -> str:
      """Combine 2 strings and reverse the result in Python.
      >>> combine_and_reverse("Hello ", "world!")
      '!dlrow olleH'
      >>> combine_and_reverse("abc", "123")
      '321cba'
      """
  
output:     combined = words + words2
      return combined[::-1]