In this task, you're given a pair of sentences, sentence 1 and sentence 2, that contradict each other. Your job is to alter sentence 2 so that the pair agree with 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 black dog with a red collar walks through the grass with his mouth open and tongue hanging out. Sentence 2: A dog swims in a pool.
Example Output: The dog is outside.

Example Input: Sentence 1: a boxer punches a boxer in the face. Sentence 2: Two polo players play polo.
Example Output: Two boxers box.

Example Input: Sentence 1: A dog running up a sandy hill Sentence 2: A dog is running down a grassy slope.
Example Output:
A dog is running.