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: Two men skateboarding in the forest. Sentence 2: Two men are outdoors.
Example Output: Two girls are in a treehouse.

Example Input: Sentence 1: Children are competing in a potato sack race at an outdoor social gathering. Sentence 2: Children participate in a potato sack race.
Example Output: Children play baseball.

Example Input: Sentence 1: A man and a woman are sitting in a rowboat on calm water. Sentence 2: A boat on calm water holds a man and a woman.
Example Output:
A couple are boarding an airplane.