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

Example Input: El primer libro del Dr. Weiss sigue siendo un gran libro para todos aquellos a quienes les inquieta el tema de la reencarnacion, asi no crean en ella.
Example Output: Positive

Example Input: A progammable thermostat that you can actually set differently for each of the seven days - perfect for people with non traditional schedules. And the 'off the wall' setting capability makes it very convenient to set up.
Example Output: Positive

Example Input: This was a joke. I am sending the pillow back. Does not come close to what was advertised. I believe the cardboard box that it arrived in would have been softer under my head. I am giving it one star just so I can post this. I only wish the stars could go negative.
Example Output:
Negative