input: 
  def reverse_combined_strings(words: str, words2: str) -> str:
      """
      Combine two given strings and reverse the resulting string.
      >>> reverse_combined_strings("Hello ", "world!")
      '!dlrow olleH'
      >>> reverse_combined_strings("Python", " is fun!")
      '!nuf si nohtyP'
      """
  
output:     combined = words + words2
      return combined[::-1]