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: Person riding wave on stomach on a blue surfboard. Sentence 2: A person on a wave.
Example Output: Nobody on a wave.

Example Input: Sentence 1: A girl wearing a pink and black shirt and jeans fixes her hair before walking up the stairs. Sentence 2: A girl is wearing a shirt.
Example Output: A girl is bald.

Example Input: Sentence 1: A person is skiing. Sentence 2: The person skis.
Example Output:
The person is snow boarding.