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 group of young people are playing band instruments in front of a crowd. Sentence 2: The band is mostly young students who are capable of playing intruments near a crowd.
Example Output: The group is not playing anything but instead are watching tv.

Example Input: Sentence 1: Pedestrians interact with street artists. Sentence 2: Street artists are interacting with pedestrians.
Example Output: The street artists do not acknowledge the pedestrians

Example Input: Sentence 1: a skateboarder grinds a rail. Sentence 2: a skateboarder is skating.
Example Output:
A biker is grinding a rail.