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 like these stair for my chi, he is only 5 pounds and this stair is easy for him to climb. plus they can easily be carried to my motorhome so he can get on the bed.
Example Output: positive

Example Input: Slips off of my glasses after few hours time. They should grip and stay but they just fall right off and I have to keep putting it back on my glasses.
Example Output: negative

Example Input: I purchased these for friend who has been traveling. The headphones arrived faster than expected and came in their own zippered case. As soon as I gave them to my friend she was overjoyed with them. The case will allow her to keep them in her purse so that they are available at any moment. She has told me that they work great with her Google phone.
Example Output:
positive