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

Ex Input:
I buy/view/listen to a lot of music video's (read, sorry night life) and this one was a disappointment. Sound varies too widely act to act. Couple of goosebump moments (I love the Mega-Guitars on Kansas City) but mostly a smorgas-bored of available talent putting in their charity work. Zero additives for the video freak and no real explanation of charitable intentions ever given. Borrow this from someone instead.

Ex Output:
Negative

Ex Input:
If you paid for this product, you overpaid. Granted, the original, out-of-print dvd of The Bikini Carwash Company sells for exorbitant prices, so my suggestion is to just download it for free through torrents and cut the video pirates and video scalpers down to size. If anything, buy the European PAL version, which is also uncut and uncensored, and available on the North American Amazon as well.

Ex Output:
Negative

Ex Input:
I used to think that there was no strategy, per se, to fishing a lake--a big tub of water you trolled until you got an arbitrary hit.This book takes an almost forensic view of a lake's features--water layers, vegetation, etc.--and shows how to read them and catch fish. It's much more detailed than I expected and I came away with a real sense of how to find trout as quickly as possible.

Ex Output:
Positive