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: I ordered the wrong size by mistake, I was able to exchange for the correct size in 48 hours without a hassle, The product? It's an Adidas, I expected quality, well... I've got it, it's a very confortable shoe.
Example Output: positive

Example Input: I’ve used this product two times. The first it was really nice to sleep on and no air leaked, the second it deflated before we even laid on it to sleep. It’s too late to return it now or else I would. I do not recommend this product.
Example Output: negative

Example Input: I have had this battery for less than a year and it is now worst than the five year old battery i replaced. It discharges even when plugged into power.
Example Output:
negative