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

Example Input: I haven't been able to watch this much because the DVD won't play in my normal (otherwise functioning) DVD player. It will play on my computer's DVD player, but without sound. The DVD will play fine on my laptop, but that's not a screen that's very conducive to practicing in front of. The DVD does play on my friend's DVD player for some reason. Also, I bought volumes 1 and 2 and both are so short, it seems obvious that they could have put all of the lessons on one DVD. I guess they knew they could make more money by making us buy both.
Example Output: Negative

Example Input: I really enjoyed this book!I couldn't put it down after the first page which compares Marshall, "An average North American Male" ... "plump and balding", to his caged pet bird - "Both had lived three fourths of their expected life span and had another fourth of life to go, if they were lucky".This sets the tone for the novel which is a thought provoking story written with wit and intelligence.I should note, however, this is not and it is a book about the character Marshall Hollenzer. It is really a book about people - the choices they make and/or the fate bestowed upon them - and journeys - both physical and spiritual.This novel is thought provoking, entertaining, and enlightening.I recommend buying at least two copies - this is the type of book that you will want to share with people you know.
Example Output: Positive

Example Input: Brainwashing of the American Investor provided invaluable insight into today's Wall Street. Steve's personal experienceon the Street provides the reader with information that one only 'wonders about', but now it's in black print for all to see!Steve also provides enormous amounts of information regarding his investing 'style'---one that appears too simplistic at first,but is based on steadfast rules and established algorithms.I have definitely benefitted from the book--for personal edification as well as financial growth! Hats off to Stevefor a treasure load of info....definitely a 'small investment'for a much bigger payout down the road!
Example Output:
Positive