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

Example Input: I bought this air mattress to use while my new bed was being shipped from back east, the bed lost air every night and I woke up almost on the floor. I tried to send it back but it was impossible to get back into the box.
Example Output: Negative

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: I have been so impressed by this book. As a UC sufferer of many years, I really felt at home reading it. There were so many things that I could relate to! The information is up-to-date and incredibly informative and helpful! And the quotes from everyone are just great - they really touched my heart and helped me to know that I am not alone in my thoughts and feelings.For those with IBD, or their friends and family, this book is an exceptional addition to the library. If you buy nothing else regarding this disease, buy this one!
Example Output:
Positive