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: Dog training on the mountain Sentence 2: A dog is taking a class.
Example Output: A dog is on a mountain.

Example Input: Sentence 1: An old man, reading a newspaper, gets his shoes shined on the street. Sentence 2: An old man is reading a newspaper about the bombing at the Boston Marathon as he is getting his shoes cleaned.
Example Output: An old man is reading a newspaper.

Example Input: Sentence 1: A rider on a dirt bike is doing a maneuver in midair over a dirt mound. Sentence 2: The bike is red.
Example Output:
The dirt bike is in midair.