input: Write a function called isAffirmativeorNegative that takes a sentence as input and determines whether the sentence is an 'affirmative' sentence or a 'negative' sentence. If the sentence contains no negation words, it should return "Affirmative". Otherwise, it should return "Negative".
  assert isAffirmativeorNegative("He always comes late but I dont mind.") == "Negative"
  assert isAffirmativeorNegative("She is very intelligent.") == "Affirmative"
  assert isAffirmativeorNegative("No one was able to answer the question.") == "Negative"
  assert isAffirmativeorNegative("") == "Affirmative"
  assert isAffirmativeorNegative("There is nothing wrong with that.") == "Negative"
output: def isAffirmativeorNegative(sentence):
      negation_words = ["no", "not", "never", "none", "nobody", "nothing", "neither", "nor"]
      for word in negation_words:
          if word in sentence.lower():
              return "Negative"
      return "Affirmative"