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 man in red pushes his motocross bike up a rock. Sentence 2: A man in a red shirt has trouble pushing his bike.
Example Output: A man wearing red with a bike.

Example Input: Sentence 1: A man works on the rear tire of a bike while a baby looks on from behind the bike. Sentence 2: A man fixes a flat on a mountain bike path.
Example Output: A man repairs a bicycle tire.

Example Input: Sentence 1: A female in a power wheelchair drives away with a group hunched behind her. Sentence 2: She has a red shirt on.
Example Output:
A woman is in a wheelchair.