input: def isAffirmativeorNegative(sentence: str) -> str:
      """ Given a sentence, identify whether it is an 'affirmative' sentence or a 'negative' sentence.
      The function first finds the negation words in the sentence and checks if any negation word exists. 
      If no negation word is found, it returns 'Affirmative'. Otherwise, it returns 'Negative'.
      
      >>> isAffirmativeorNegative("He always comes late but I dont mind.")
      'Negative'
      >>> isAffirmativeorNegative("I am going to the park.")
      'Affirmative'
      """
output:     negation_words = ["not", "no", "never", "dont", "doesnt", "didnt", "wont", "cant", "couldnt", "shouldnt", "wouldnt"]
      words = sentence.lower().split()
      for word in words:
          if word in negation_words:
              return 'Negative'
      return 'Affirmative'