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

Example Input: At first I was disappointed that this wasn't a longer book, but then I realized that it is great to give away to curious friends and parents as an introduction to Love and Logic. I just wish it was a little cheaper.
Example Output: Positive

Example Input: I've bought several air beds from various manufacturers. I bought one identical to this one 1 1/2 years ago. It was comfortable but lost air after 3 months. I justified this as the user may have not taken care. However, I now believe its the brand. This one would not inflate at all. I will not buy this brand again. I've had great life from a better brands.
Example Output: Negative

Example Input: I only used it a couple of times, a tiny bit of water leaked into the battery compartment and now it is rusted and won't turn on.
Example Output:
Negative