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 dachshund puppy jumps on a bed. Sentence 2: A dog is in the air.
Example Output: A dog is sleeping in the den.

Example Input: Sentence 1: Several people at an outdoor picnic. Sentence 2: Humans in a group.
Example Output: A single man eats alone.

Example Input: Sentence 1: A person wearing a hat and carrying a knapsack walks uphill on a sand dune under a dark, cloudy sky and leaves the only visible footprints behind. Sentence 2: Someone walks up the hill through the sand.
Example Output:
The person sits cross legged.