Definition: 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.
Input: I just got permanent retainers on upper and lower teeth. Bought Super Floss and found the plastic threader is so flimsy and bends, I can't get it through the teeth. I tried the floss on teeth without the retainers and it shreds leaving fibers stuck in the teeth, cuts into my fingers and between some teeth won't even slide down. Want a refund!
Output:
negative