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 went through three of these, neither one of them would maintain the air pressure and would slowly deflate. This occurred within 2 uses for each of the 3 mattresses i had. I considered maybe the person sleeping on it was too heavy, but alas, the person is 210 pounds and the weight limit is 300, so that wasnt it. I thought maybe it was punctured, but if it was the person would have awoken on the floor instead of on a supper jeloutnous rubber blob, so that was not it either. What conclusion left is there- this thing sucks and doesnt maintain the air.
A:
Negative