Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.

Example Input: This CD is great for some people, but I think a lot of other people are buying it who maybe shouldn't.For the Nirvana fanatic with money, get the full boxed set, you will probably find the DVD and the book to be worth the extra money, even if you don't listen to the added tracks.If you aren't a fanatic, stick with the albums. You will not like the low sound quality of the recordings.Now, for the Nirvana fanatic who's a bit short on cash, but absolutely has to have "Do Re Mi" as part of his collection, that's who this is for. "Do Re Mi" is an excellent track, one of Nirvana's best...so if you are a serious Nirvana fan, you DO need to have that one.
Example Output: Positive

Example Input: This movie is just plain sad. In addition to mediocre acting, the special effects were just as bad. In one scene you could plainly see the safety wire connected to the motorcycle. Bad diologue and senseless nudity made the film even worse. The plot drug and the resolution could have been solved a little sooner than it did. They came up with a lame chase scene with an airplane cruising on the ground after a motorcycle. Maybe that was a last ditch effort to make the movie a little bit more exciting. The only slightly interesting character was played by LL Cool J. His on camera presence is always rather captivating to me. It also carried him through a poorly written character. Since most of the movie took place on the track, there was more of the game than I could really put up with. Avoid it.
Example Output: Negative

Example Input: Bought this product for a friend's visit back in late October. Since then (It is now early February), it has been slept on for a total of seven nights by two different normal sized adult guests, and promptly deflated when a third guest tried to sleep on it this past week. To its credit, the product did last just fine through those seven nights. It did, however, break not too long after the 90 day warranty ended and we have no reason to believe we will be able to repair it or otherwise recoup our loss. Purchase with the understanding that this is basically a disposable air bed with a warranty that seems conveniently short.
Example Output:
Negative