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 appears to be calling someone on his phone while a child is standing behind him. Sentence 2: A child is wearing blue jeans.
Example Output: A person is using a phone.

Example Input: Sentence 1: A man scooping sand up in the air at the beach while another little girl watches. Sentence 2: A man and his daughter are playing together.
Example Output: A girl is watching a man scoop up sand.

Example Input: Sentence 1: A man is cleaning a window with a sign on it. Sentence 2: A man cleans a storefront sign.
Example Output:
A person cleans a window.