input: Write a function to classify a given sentence as either 'Affirmative' or 'Negative' by identifying negation words. If the sentence contains negation words, classify it as 'Negative'; otherwise, classify it as 'Affirmative'. If the sentence is empty, classify it as 'Affirmative'.
  assert isAffirmativeorNegative("He always comes late but I dont mind.")=='Negative'
  assert isAffirmativeorNegative("She is happy today.")=='Affirmative'
  assert isAffirmativeorNegative("No one is going.")=='Negative'
  assert isAffirmativeorNegative("He will not be coming.")=='Negative'
  assert isAffirmativeorNegative("")=='Affirmative'
output: def isAffirmativeorNegative(sentence):
      negation_words = ["not", "no", "never", "none", "nobody", "nothing", "neither", "nowhere", "hardly", "scarcely", "barely"]
      if not sentence:
          return 'Affirmative'
      for word in negation_words:
          if word in sentence.lower():
              return 'Negative'
      return 'Affirmative'