Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.
One example is below.
Q: I've read this book with much expectation, it was very boring all through out the book
A: Negative
Rationale: Review writer does not like the book because it was boring, therefore it is a negative review.
Q: I have purchased this matress 3 weeks ago. The price is pretty affordable, and it actually looks like a normal bed. At the beginning it leaked a bit, but after that (I really don't know why) it was ok. It is pretty comfortable. The built-in pump works very good and very convenient in use. The only two things are that I don't like in this matress are that one side of this matress is higher by 2-3 mm than another. And when you sleep on it you feel like there is a small angle. I mean the matress is not 100% horizontal. Another thing that peaces me off is the noise that comes from the matress when you move or somehow turn over. But overall it is good substitution if you need a temporary bed.
A:
Positive