In this task, You are given a review of Amazon's food products. Your task is to divide them into two classes: negative or positive, depending on the content of the review.

Example Input: Very frustrated. Opened upon receiving so that it can expand. It's been 6 hours and still hard as a rock and curled up. Wondering how long it's going to take to expand to isn't normal shape.
Example Output: negative

Example Input: Product was exactly as described, worked like a charm. Good quality material does what I want to do, and looks great. I would like to see a few more aluminum crimps in the bag to do multiple loops on the cable in the future. Overall great product.
Example Output: positive

Example Input: She sleeps so much better with this! It does seem to run slightly big. We have the 3-6 month and had to wait until she was over 4 months for it to fit right. Since then she sleeps all night and wakes about once, maybe twice, to feed then straight back to sleep.
Example Output:
positive