input: 
  def combine_and_reverse(word1: str, word2: str) -> str:
      """Combines two given strings and returns the reversed result.
      >>> combine_and_reverse("Hello ", "world!")
      "!dlrow olleH"
      >>> combine_and_reverse("abc", "123")
      "321cba"
      """
  
output:     combined = word1 + word2
      return combined[::-1]