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

Ex Input:
This product requires a stereo player in which the balance is turned totally to the left. Most auto systems have that capability. However if you have Dolby or SurroundSound, it can be difficult (and maybe impossible) to play the cassette without hearing two recordings at the same time. Unfortunately neither the packaging nor the website will warn you of the problem. You therefore should think before buying. Once you have opened the packaging you may be unable to return the product.

Ex Output:
Negative

Ex 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.

Ex Output:
Positive

Ex Input:
I heard a song or two and thought same o same o,but when i listened to songs like "blue angel","lanna" and 'mama" the hair just rose off my neck.Roy is trully an amazing singer with a talent you don't find much now days.

Ex Output:
Positive