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: Brown and white dog runs towards camera, casting long shadow on dirt. Sentence 2: A brown and white dog is running.
Example Output: A cat runs towards a camera.

Example Input: Sentence 1: A person in a hat is playing with a boy on a beach. Sentence 2: An individual is running with a boy outside.
Example Output: Someone is playing tag with a girl inside the house.

Example Input: Sentence 1: Boys and men, mostly all wearing helmets, hang on to two separate cars while they ride skateboards. Sentence 2: A group of males is skateboarding by holding onto moving cars.
Example Output:
Boys and men don't know how to ride a skateboard.