input: Write a function to check if a given sentence is an 'affirmative' sentence or a 'negative' sentence by identifying negation words. If the sentence contains negation words, it should return "Negative"; otherwise, it should return "Affirmative".
  assert isAffirmativeorNegative("He always comes late but I dont mind.") == "Negative"
  assert isAffirmativeorNegative("She is very happy today.") == "Affirmative"
  assert isAffirmativeorNegative("No one is allowed to enter.") == "Negative"
  assert isAffirmativeorNegative("I have never seen this before.") == "Negative"
  assert isAffirmativeorNegative("We are going to the park.") == "Affirmative"
output: def isAffirmativeorNegative(sentence):
      negation_words = ["not", "no", "never", "dont", "isnt", "arent", "wont", "cant", "doesnt", "didnt"]
      words = sentence.lower().split()
      for word in words:
          if word in negation_words:
              return "Negative"
      return "Affirmative"