In this task, you're given a pair of sentences, sentence 1 and sentence 2, that neither agree with nor contradict each other. Your job is to alter sentence 2 so that the pair clearly 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 young girl is playing on a forest log. Sentence 2: A young girl is playing on a large forest log on a nice day.
Example Output: A young girl plays outside.

Example Input: Sentence 1: Man with a white hat and white shirt playing many instruments on stage next to a sign that says Appeared on Jimmy Kimmel. Sentence 2: The man is performing a concert.
Example Output: The man is making music

Example Input: Sentence 1: A person walking up the stairs. Sentence 2: This is his daily exercise.
Example Output:
The person is going up.