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: A ribbon dancer wearing a neon pink and green outfit with only one left white sleeve leaps high into the air- throwing her ribbon out before her in a "c" shape. Sentence 2: A person is using her ribbon to make shapes.
Example Output: A musician is practicing singing in front of the mirror naked.

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: The black dog win the fetching contest as it returns from the water Sentence 2:  Thedog wins the fetching contest as it returns from the water
Example Output:
A cat is playing with yarn.