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: I have very hard water where I live. I use this once or twice a week and it really helps remove the build up on my hair. I'll definitely keep using this.
Example Output: positive

Example Input: This item does not heat despite being turned on. In addition, the rack was nearly impossible to put together to be free standing. The provided screws were too big for the holes. Terrible product! To top it off it had absolutely no instruction on how to put together as freestanding.
Example Output: negative

Example Input: I thought this would help me give my husband back rubs but it hurts my hands more and I can't feel how much pressure I'm using while trying to rubs the knots out of his back. Maybe if I bought it to use on myself I'd feel better about this but for using on someone else it was a wasted purchase. Hurts my wrists to use it.
Example Output:
negative