input: def extract_words(sentence: str) -> list:
      """ Extract non-vowel words from a given sentence.
      >>> extract_words("This machine learning project is challenging.")
      ['machine', 'learning', 'project', 'is', 'challenging.']
      """
output:     words = sentence.split()
      vowels = "aeiouAEIOU"
      result = [word for word in words if not any(char in vowels for char in word)]
      return result