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 bought two units. After less than two weeks of daily use, beverages left in containers up to six hours tasted metallic, triggering nausea and vomiting. I returned both items. They look great, but my I will never buy this product again, and will caution my friends to avoid this brand.
Output:
negative