input: Write a python function to classify a sentence as "negative" if it contains the word "horrible", otherwise classify it as "positive".
  assert classify("This is an horrible movie") == "negative"
  assert classify("This is a great movie") == "positive"
  assert classify("The weather is horrible today") == "negative"
  assert classify("I had a wonderful day") == "positive"
output: def classify(sentence):
      if "horrible" in sentence:
          return "negative"
      else:
          return "positive"