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: Great book if you bought an air fryer and want some more recipes!I just tried a few recipes, but it's really a good starter book for learning the initial use of your fryer.
Example Output: positive

Example Input: I bought two of these alarm clocks for my sons' bedrooms. Like other reviews, these clocks do not keep accurate time in either room. The only purpose they serve at this point is to charge their cell phones overnight. This product is a waste of money and I highly discourage consumers to purchase it.
Example Output: negative

Example Input: I have had lumbar surgery three times in the past nineteen years. I bought this to elevate my legs at night when I sleep. It really takes the pressure off your sciatic nerve, and if you are someone that suffers from edema it also helps to reduce the swelling in your feet ankles and calves
Example Output:
positive