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]: Being a contractor for 25 years I know how to calibrate a stud sensor... this is the biggest piece of junk I've ever bought!!! I wished I could get my money back!!!
[A]: negative

[Q]: I absolutely like it The brain booster influences well on my alertness and memory. I feel much more clear after half an hour of taking them. I think that they even improve my critical thinking.
[A]: positive

[Q]: nice looking fan, but the power is not that strong. Put extra ice water into the fan to make the air cooler. It is a nice decor for the office though.
[A]:
positive