input: Write a function to determine if a given sentence is an 'affirmative' sentence or a 'negative' sentence. The function should use natural language processing techniques to identify negation words and classify the sentence accordingly. If the sentence contains negation words, it should be classified as 'Negative'; otherwise, it should be classified as 'Affirmative'.
  assert isAffirmativeorNegative("He always comes late but I dont mind.") == "Negative"
  assert isAffirmativeorNegative("She is a brilliant student.") == "Affirmative"
  assert isAffirmativeorNegative("No one is perfect.") == "Negative"
  assert isAffirmativeorNegative("Everyone enjoyed the movie.") == "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"