Given reviews from Amazon, classify those review based on their content into two classes: Negative or 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: I bought this from the same co. before christmas and was stunned that the price had doubled. On the page the price was not clear!
Example Output: Negative

Example Input: Had to call the MFGR'er to be informaed that the model I was sent does not fit on any GOLF with US Specs,it was manufactured for the UK version of the Golf, which has less "plumbing" and emmission gadgetery.For my model, the only option is the replacement filter (square) that fits in the filter box.
Example Output:
Negative