input: 
  def reverse_combined_strings(str1: str, str2: str) -> str:
      """ Combines two strings and returns the reversed result.
      >>> reverse_combined_strings("Hello ", "world!")
      '!dlrow olleH'
      >>> reverse_combined_strings("Good ", "morning!")
      '!gninrom dooG'
      """
  
output:     combined = str1 + str2
      return combined[::-1]