input: Write a function to determine if a given sentence is an 'affirmative' or a 'negative' sentence by identifying negation words. If a sentence contains no negation words, it is considered 'affirmative'; otherwise, it is 'negative'. If the sentence is empty, return "Empty".
  assert isAffirmativeorNegative("He always comes late but I don't mind.") == "Negative"
  assert isAffirmativeorNegative("She was very helpful.") == "Affirmative"
  assert isAffirmativeorNegative("There is no issue.") == "Negative"
  assert isAffirmativeorNegative("") == "Empty"
output: def isAffirmativeorNegative(sentence):
      negation_words = ["no", "not", "never", "none", "nobody", "nothing", "nowhere", "neither", "nor"]
      if not sentence:
          return "Empty"
      for word in negation_words:
          if word in sentence.lower():
              return "Negative"
      return "Affirmative"