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

Example Input: As a student of jiujitsu i understood alot of the moves but i found that without previous knowledge these pictures and instructions were difficult to understand. I feel there is alot of good information but not worth buying.
Example Output: Negative

Example Input: This product does not work with my ibook G4. As stated by some earlier reviews by other customers, the charger toggles between charging and not charging. Occasionally, if it is left on, it will continuously charge. I thought about keeping it, but it is unreliable and there are other third party options for $10 more.This one is going back to Amazon.
Example Output: Negative

Example Input: If you watch trasformer 1, don't spend your time to watch this, even it is free. I consider this movie is just below the episode 2 and the 2 below 1. And nothing is new.
Example Output:
Negative