input: def contains_words(input_string: str, words: list) -> bool:
      """ Check if the input string contains all the words in the given list of words.
      >>> contains_words('This is a test', ['test', 'this', 'is'])
      True
      >>> contains_words('This is a test', ['test', 'this', 'hello'])
      False
      """
      for word in words:
          if word.lower() not in input_string.lower():
              return False
      return True
output:     for word in words:
          if word.lower() not in input_string.lower():
              return False
      return True