Instructions: 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: Do not waste your money on this product. The first time I used it, I let it on for 90 minutes and got chemical burns on both feet. I waited a few months and tried again. This time I left it on for 60 minutes. The product did nothing.
Output:
negative