Given reviews from Amazon, classify those review based on their content into two classes: Negative or 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: There are people who will start reading this book then about 100 pages into it realize that it's going nowhere fast. Take my advice and keep reading. It gets much better, and more interesting. The ending is really good, and might have even upped this review a star.ac
Example Output: Positive

Example Input: Purchased this screen last week and it came with noticeable scrapes across the top. The box it came in was gigantic with plenty of packaging material, but the screen was packaged loosely at the bottom. However, since it was in another smaller box, I'm thinking that the scraping was there to begin with, and not from shipping. Still deciding whether to go through the trouble of exchanging it since another reviewer said they had the same damage. I wouldn't want to risk getting another with the same damage and I really need a screen right now. Other than the damage, it's a very nice screen.
Example Output:
Negative