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

Example Input: I used this program for my science class. My students loved it! They learned some interesting facts, saw damage from earthquakes we talked about in class and never once did I hear that it was boring! Can't beat that!
Example Output: Positive

Example Input: I bought this first alert CO alarm for my home in Wisconsin.When I started to read the instructions I found that this product is not UL list! How can a safety item like this not be UL listed.I did some research and found out first alert changed testing labs to save a few bucks and do not use the most well known UL. What's up with that...So I returned this CO and purchased the Kidde KN-COB-DP-H Plug-In Carbon Monoxide Alarm. The Kidde unit cost less too, so I saved a few dollars! Always pays to READ THE FINE PRINT.
Example Output: Negative

Example Input: I am a big JVC fan, but I do not like this model, I was suspiscious when I saw several units in the return section of the store. I bought one anyway (new) and must say I am not happy. The unit sends out clicks to the receiver once in a while, the transition between scenes is not always smooth,(like a little pause) and while it is still fairly new I can't get any DVD,CD or even a DVD headcleaner to work. All I get is a "incorrect disc" message.
Example Output:
Negative