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]: Really does a good job of pulling the dialogue out on the tv shows. Over all sound is great. Lots of available adjustments which I really like. I added a woofer and it works great with the sound bar. We are very happy with the purchase.
[EX A]: positive

[EX Q]: Very impressed! Was nervous but it looks way more expensive then it really is. The engraving were perfec. It's an awesome knife, my boyfriend loves it! Fast shipping too!
[EX A]: positive

[EX Q]: This did not work at all. I cleaned and bathed my dog to get a fresh coat, applied the collar and she's still infested. We've treated the house too. This was a waste of money.
[EX A]:
negative