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

Example Input: At 60 pages,this is over-priced and not a course for adults. As basic instruction for those 10 and under, it is probably okay. For anyone who even doodles while talking on the phone- forget it!
Example Output: Negative

Example Input: Comfortable right out of the box. Well made. Durable. Can't vouch for the waterproofing of them, as I have learned many moons ago.....no shoes are waterproof. I refuse to test them, once you do...they never seem to be the same.
Example Output: Positive

Example Input: This is a very fascinating book that lets you see inside the minds of five unique characters (plus Swan herself). It centers around the five amateur models on the shortlist to replace supermodel Swan for a cosmetics campaign. There are so many things going on in this book that it never has time to get boring! The characters are written with excellent detail and realism and the story has lots of twists and turns. Impossible to put down!
Example Output:
Positive