input: def reverse_words(sentence: str) -> str:
      """ Reverse the order of words in a sentence while keeping the order of characters 
      in each word the same.
      >>> reverse_words("This is a sentence.")
      'sentence. a is This'
      >>> reverse_words("Python programming is fun")
      'fun is programming Python'
      """
output:     words = sentence.split()
      reversed_words = words[::-1]
      return ' '.join(reversed_words)