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: Very frustrated. Opened upon receiving so that it can expand. It's been 6 hours and still hard as a rock and curled up. Wondering how long it's going to take to expand to isn't normal shape.

A: negative
****
Q: Just what i was looking for. At first i had my doubts about these headphones before buying them, but after receiving them, i'm really satisfied! The speaker quality is amazing, and so is the sound quality in the earbuds. It's comfortable, it sounds great on calls. It's great overall and really makes my life at work easier. No tangles or anything, i'm able to move and go throughout my day listening to music or chatting.

A: positive
****
Q: When the ache/pain in my upper back won't stop, I always turn to this product. It takes away the pain almost immediately. It is adjustable and comfortable to wear. I love it!!

A:
positive
****