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 have a smallish black dog that disappears into shadows and night an this collar is perfect to help keep an eye on him. He is so small I was able to get two equal lengths out of the collar portion and I love that it is rechargeable.
Example Output: positive

Example Input: My scale was delivered and when I went to turn it on it did nothing. I tried switching batteries but nothing worked. I tried contacting the support email that was listed on the instructions and was never given a reply. I highly suggest you don't buy this item.
Example Output:
negative