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 man stands behind a wall on a busy city street. Sentence 2: The man is obsured from view outside.
Example Output: The man is walking down a busy city street.

Example Input: Sentence 1: a biker enjoys a coffee. Sentence 2: A person is having a beverage.
Example Output: A biker is drinking beer and playing pool with his friends.

Example Input: Sentence 1: Boy playing on the swing. Sentence 2: A boy is on a swing.
Example Output:
A boy jumps over a ball.