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 Input:
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 Output:
positive

Ex Input:
I use my mobile phone constantly throughout the day for work and need headphones to so I can have both hands free. These headphones are amazing, comfortable, and a great buy.

Ex Output:
positive

Ex Input:
For the second time I received an Amazon envelope unsealed and empty. I would like a replacement sent to me. I can send a photo of the empty envelope if that would help.

Ex Output:
negative