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

Input: Consider Input: This book in the beginning was so slow that I finished a book twice it's length before I finished the first chapter of Tess of the D'Urdubervilles.

Output: Negative

Input: Consider 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.

Output: Positive

Input: Consider Input: If this is the "best of the box" then thank God I didn't buy the box. Most of this stuff should never have left Cobain's closet.
Output: Negative