In this task, you're given a pair of sentences, sentence 1 and sentence 2, that agree with each other. Your job is to alter sentence 2 so that the pair contradict each other. Generated sentences must be short, with less than 15 words. New information can be introduced. Avoid using pronouns to confuse the subject of the sentence.

Example Input: Sentence 1: Group of runners participate in a marathon. Sentence 2: People are running.
Example Output: People are sitting in a library.

Example Input: Sentence 1: A string quartet practices for an up-coming performance. Sentence 2: A string quartet practicing.
Example Output: The woodwind section warming up for a performance.

Example Input: Sentence 1: An ambulance on the street with its lights on at night. Sentence 2: An ambulance has turned it's emergency lights on.
Example Output:
An ambulance is parked in a garage for the night.