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

Example Input: Good, sturdy platform for squatting under a barbell. Very firm. Laces are long enough to wrap around ankles, and back of shoe forms a fair notch to retain the laces and keep them from sliding up and off the shoes - would have been better had there been a rear loop. Shoes are better without the insoles because they put a spongy foam wedge under the heels. I replaced them with thin flat insoles from a pair of water shoes. One could cut the foam wedge and use the included insoles. There is no raised heel other than that foam wedge. They run true to size or slightly tight.
Example Output: Positive

Example Input: This book in the beginning was so slow that I finished a book twice it's length before I finished the first chapter of Tess of the D'Urdubervilles.
Example Output: Negative

Example Input: great if you like doing stupid tasks in a tony hawk style manner. only problem is the time clock is always ticking making this an arcade adventure rather than a video game. Don't waste the money, good graphics or not, this game is not entertaining.
Example Output:
Negative