input: Write a function to determine if a given sentence is an 'affirmative' sentence or a 'negative' sentence. If there are no negation words in the sentence, return "Affirmative", otherwise return "Negative".
  assert isAffirmativeorNegative("He always comes late but I dont mind.") == "Negative"
  assert isAffirmativeorNegative("I am very happy today.") == "Affirmative"
  assert isAffirmativeorNegative("There is no doubt about it.") == "Negative"
  assert isAffirmativeorNegative("She is always on time.") == "Affirmative"
  assert isAffirmativeorNegative("Nobody loved the movie.") == "Negative"
  assert isAffirmativeorNegative("") == "Affirmative"
output: def isAffirmativeorNegative(sentence):
      negation_words = ["no", "not", "never", "none", "nobody", "nothing", "neither", "nor"]
      words = sentence.lower().split()
      for word in words:
          if word in negation_words:
              return "Negative"
      return "Affirmative"