input: Write a function to determine if a given sentence is an 'affirmative' sentence or a 'negative' sentence based on the presence of negation words. If the sentence contains any negation words, return "Negative"; otherwise, return "Affirmative". If the input sentence is empty, return "Affirmative".
  assert isAffirmativeorNegative("He always comes late but I dont mind.") == "Negative"
  assert isAffirmativeorNegative("She is always on time.") == "Affirmative"
  assert isAffirmativeorNegative("There is no one here.") == "Negative"
  assert isAffirmativeorNegative("") == "Affirmative"
  assert isAffirmativeorNegative("Everyone is happy.") == "Affirmative"
output: def isAffirmativeorNegative(sentence):
      negation_words = ["no", "not", "never", "none", "nobody", "nothing", "neither", "nor"]
      if not sentence:
          return "Affirmative"
      for word in negation_words:
          if word in sentence.lower():
              return "Negative"
      return "Affirmative"