In this task, you're given a pair of sentences, sentence 1 and sentence 2, that agree with each other. Your job is to alter sentence 2 so that the pair 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 woman in a purple shirt running a marathon getting water splashed on her. Sentence 2: A woman in a shirt running a marathon getting water splashed on her.
Example Output: A man in a purple shirt running a marathon getting water splashed on her.

Example Input: Sentence 1: Hispanic woman hanging out her window with small boy. Sentence 2: A woman holds her small boy in a window.
Example Output: An old man sits in a windowsill with is cat.

Example Input: Sentence 1: Two men are running with numbers pinned to their shirts. Sentence 2: There are people running.
Example Output:
A group of people are walking on treadmills.