Definition: 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.
Input: i bought this for my dog - he loved it. however, i noticed that he stopped pooping and came to realize (after googling) that it caused him to be constipated. His stomach was very bloated and I could feel that his colon was obstructed by something -- a piece of undigested greenies treat. I gave him all some olive oil and mineral oil and massaged his colon and eventually he started pooping again. I did notice that the greenie came out undigested! This product is really dangerous and I would love to join in on a class action lawsuit against this unethical company. They have made greenies 'tasty' but that is all it is. a tasty but dangerous product.
Output:
Negative