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.

Sentence 1: Man in a black shirt walking down a large set of stairs. Sentence 2: A man in a white shirt is walking up the stairs.
A person in black is moving around

Sentence 1: A man walking his dog while using his cellphone at dusk. Sentence 2: A man is talking to the dog on a cellphone.
A man is on his cellphone while walking his dog.

Sentence 1: three dogs playing on a beach Sentence 2: There is one dog

There are three dogs