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

Example Input: As a student of jiujitsu i understood alot of the moves but i found that without previous knowledge these pictures and instructions were difficult to understand. I feel there is alot of good information but not worth buying.
Example Output: Negative

Example Input: Cities Of The Red Night is one of the most enjoyable books I have read. The novel has different storys that as the novel progresses intertwine. The books presents situations that are unbelievable but because of Burroughs genius you are convinced of that they are happening in a world not too far from are own. I think he was trying to show the questionableness of what is presented to us as reality. This book also has some of the most vivid pictures and unforgetable lines that I have read. It is Burroughs masterpiece.
Example Output: Positive

Example Input: Boring. What was I expecting? Something that would give me insight into my own abilities to heal self and others. This didn't do it. Especially since it wasn't in English.
Example Output:
Negative