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

Ex Input:
After reading all the great reviews on this product on Amazon, I decided to go for this. I don't typically have good results from diet products, but I figured I'd give it a shot. I've been taking these for 3 weeks, as directed, and I might as well have been taking sugar pills for all the more this is doing for me. I felt like my appetite increased, I haven't lost any weight at all - in fact I've been fluctuating up and down 3 pounds for the past couple of weeks. I gave this two stars because I didn't feel the anxiety or sleeplessness that some people complained about, but I'm still disappointed. I was hoping I'd find something that actually worked!

Ex Output:
Negative


Ex Input:
I am using this textbook in a class and it is a whopper. Wonderful pictures, easy to read, clear colors and understandable. I've been working in prisons for 5 years and this book makes a lot of sense. You ought to read their sections on women in prison and on probation. I loved the parts on geriatric prisoners (old cons) and the death penalty. And it is easy to read. More!

Ex Output:
Positive


Ex Input:
This book was recommended by an instructor. I am new to this crazy pursuit of oil painting. My instructor called this her "bible" of color theory, but I honestly didn't understand much of it. Way too detailed, written in language that may be appropriate for someone who has a degree in fine art or art education, but certainly not for a beginner.

Ex Output:

Negative