input: 
  def reverse_words_order(sentence: str) -> str:
      """ Reverses the order of words in a sentence while keeping the order of characters in each word unchanged.
      >>> reverse_words_order('This is a sentence.')
      'sentence. a is This'
      >>> reverse_words_order('Python is great')
      'great is Python'
      """
      words = sentence.split()
      reversed_sentence = ' '.join(words[::-1])
      return reversed_sentence
  
output:     words = sentence.split()
      reversed_sentence = ' '.join(words[::-1])
      return reversed_sentence