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.

[Q]: This thing didn't even last on the phone. It wouldn't even install properly. I've put this type of screen protector on about 25-30 phones and thought I would give this one a try. Big mistake. Stay away
[A]: negative

[Q]: Not water tight...? moisture inside lenses after only a couple weeks of installed use. Was sent replacement, and it did the same after only a couple weeks. Then after about 4 months half of the lights stopped working.
[A]: negative

[Q]: Small but powerful. I was pleasantly surprised to see this heater provide heat for my office space. Its adjustable thermostat works perfect and its amazing how quickly it heats up. This space heater warmed everyone next to me and myself all day. I highly recommend for everyone.
[A]:
positive