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

Ex Input:
A really fun book, well worth your time if you like Pratchett. None of our old pals [Rincewind, Gaspode, Vimes, Susan] put in an appearence [other than the guy WHO TALKS LIKE THIS and an old monk with a broom, and they but briefly], but it does add some info to the overall Discworld mythology, and provides some laughs as well.

Ex Output:
Positive


Ex 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.

Ex Output:
Positive


Ex Input:
This is the greatest Christmas story every made or told. I only buy "Charlie Brown" Christmas trees now. My wife hates them but she doesn't understand what Christmas is all about.

Ex Output:

Positive