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: People with numbers on their chests are running in a pack. Sentence 2: Marathon runners end up grouped together after a collision between runners.
Example Output: People in a race are grouped together.

Example Input: Sentence 1: A man wearing headphones is checking the screen of a handheld device while on the street. Sentence 2: Sue was looking at her ipad.
Example Output: Bob was wearing his headphones and checking his ipod while walking.

Example Input: Sentence 1: People are hiking on a mountain. Sentence 2: A family hiking in the woods.
Example Output:
People hiking outdoors.