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

Example Input: I Have had trouble with HP and XP since upgrading. Although they say it is xp compatable with driver, it is not. Will cause system to lock up and when I called HP they blamed XP. Bought a Epson and first time install without a hitch. Hope this helps and God bless you!
Example Output: Negative

Example Input: The book covers several generations, so with each generation you have to re-learn all the characters. It is difficult to keep track of who's who when every time you get to know the cast, 200 years suddenly pass and we're in the middle of a new crisis. I didn't read the whole series because of this -- it was obnoxious.
Example Output: Negative

Example Input: Only used a handful of times and the bed already leaks air. Waste of money. I know it shows a one star rating but the true rating is zero stars.
Example Output:
Negative