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: I purchase a Protect-A-Bed mattress cover at a mattress store, salesman said to wash it twice prior to use. He did not say to dry it with towels and sheets. Its supposed to be waterproof, one of our cats proved its not, contacted company, they asked if dried on medium with towels and other bedding, I said no, no one told me and not anywhere on package does it state needs to be protected in the dryer. Company sent another cover,this time on low setting which is mostly air fluff with towels and other sheets and it was scorched in 3 places. Both were scorched on medium and low heat, dryer is electric which is not as hot as gas. I'm getting my $90 back that I was charged at a mattress company. Not worth the money if you can't dry it because it has cheap plastic backing.
Solution:
Negative