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

Now, solve this: Would not purchase this item again. Used in spare bedroom for guests. Hardly used, until now. Hoping top have Xmas guests use. First to lay on it, and center ring pooped.Still usable, but uncomfortable. The second night used bed hissing sound and a large leak appeared. They provide plastic to repair leaks, but do not provide any adhesive. I have to eat it now because I had until 11/12/12 to return.I can get partial credit, not including shipping if I just had just kept the box and shipping label for 3 months.
Solution:
Negative