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 turbaned men ride motorbikes away from the viewer down a tree edged street while a white van follows them. Sentence 2: A group of men ride motorbikes as a van follows them.
Example Output: Motorcycle riders are stopped and drinking some coffee.

Example Input: Sentence 1: A boy and three girls in blue school uniforms walk down a dirt-covered road. Sentence 2: The children are wearing their school uniforms.
Example Output: The children are playing in the dirt.

Example Input: Sentence 1: A boy is performing a trick on his skateboard beneath white clouds and a blue sky as four sitting guys watch him. Sentence 2: A boy is riding a skateboard while four people watch him
Example Output:
A boy rides his bicycle in the park alone.