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: Very frustrated. Opened upon receiving so that it can expand. It's been 6 hours and still hard as a rock and curled up. Wondering how long it's going to take to expand to isn't normal shape.
Example Output: negative

Example Input: Keep your money! I bought this so I could check my husbands BP. I took it out of the package, set it up, and took his BP. The sphygmomanometer broke in the first use. I didn't even get to finish taking his BP. It felt really cheap too. I also didn't like that I couldn't hook the sphygmomanometer to the cuff. It is part of the pump.
Example Output: negative

Example Input: These are not gluten free. The seller put incorrect product information on the package. this is also smaller than expected. NOT CERTIFIED GLUTEN FREE.
Example Output:
negative