Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.
Example: I've read this book with much expectation, it was very boring all through out the book
Example solution: Negative
Example explanation: Review writer does not like the book because it was boring, therefore it is a negative review.

Problem: I bought the bed with the idea of using it during one week while my father was visiting. It fulfilled its purpose perfectly. It's comfortable, it inflates and deflates very quickly and it's pretty high. There are two reasons why I am not giving it a 5-star score: a) I used sheets and still, when I woke up, my back was sweating. I guess that it is a problem with all these beds that are made of plastic, but... that is a drawback. b) I haven't been able to fold it and fit it in the bag again, it's almost impossible.Anyway, overall, it's a great deal for its price. I would absolutely recommend it and the problems I pointed out are probably a problem in all air beds.
Solution: Positive