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

Ex Input:
While old and out of print, this book is a very good way to learn the basics of photography. You have to ignore most of the references to digital cameras as the technology has changed a lot.

Ex Output:
Positive

Ex Input:
This was my first purchase of a vibrator and was very disappointed. It was shipped very discreetly from Amazon directly, but it didn't work. I put in fresh batteries and it wouldn't turn on. I even tested the batteries, they were good, but this rabbit wasn't. Unfortunately, Amazon doesn't take returns on this type of personal product. I simple won't buy anything made by California Exotics again. I'll try one of the other brands next time.

Ex Output:
Negative

Ex Input:
This game makes you do the same things over and over, it never holds my son's attention long enough to get to the next level. There is no choice of games you have to do every thing in order. We have another Rescue Heroes game and both my boys 3 and 6 love it, but this one is a dog!

Ex Output:
Negative