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 door in a tall concrete wall Sentence 2: A door in a wall of at stone building.
Example Output: A door in a wall.

Example Input: Sentence 1: A man in a baseball cap is playing a shooting game in an arcade with a friend. Sentence 2: A man is playing an arcade game the mall.
Example Output: A man is playing an arcade game.

Example Input: Sentence 1: A man is leading two small ponies on a walk at a park. Sentence 2: A man prepares ponies for a children's birthday party.
Example Output:
A man leads ponies through the park.