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.

[EX Q]: I was taking this supplement to help me sleep. They were effective once I started taking two capsules just after supper. However, I did not sleep through the night. I am still trying different supplements
[EX A]: positive

[EX Q]: My 3 year old loves this piano! It is so fun and the microphone is a great bonus! Lots of musical options to use when playing with this adorable piano!
[EX A]: positive

[EX Q]: If this story is true, and there is plenty of expert testimony to assume it is, then this man went half crazy at not being allowed to solve man's biggest problem...clean energy at zero cost. Well worth the time to watch.
[EX A]:
positive