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 children, one wearing purple, the other black, ride a single bike on the pavement. Sentence 2: Two children ride the same bike.
Example Output: Two adults ride a double seater bike.

Example Input: Sentence 1: A person in a purple dress, black hat, and pink scarf runs on a road. Sentence 2: A person is running on the road.
Example Output: A woman wearing jeans skips down the road.

Example Input: Sentence 1: A person surfing a wave. Sentence 2: A human outside.
Example Output:
A person sitting on the beach.