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

Example Input: Umbra Coretto 24 to 36-Inch Decorative Tension Rod, BlackThe rod is really good looking. However, because it is so thin, the weight of my shower curtain keeps causing the rod to come loose. If I had any idea, I probably would not have bought the rod. However, my shower is at the wider end....so maybe a person would have better luck if their shower is closer to 24".
Example Output: Negative

Example Input: This portable heater is good for use in your office, den or sleeping area..It is quiet and efficient,and is good for spot heating...please keep away from drapes or rugs,and small children,who might mistake this heater for a toy...Otherwise this is a good deal...Mine came with a remote to adjust setttings more easily...4 star rated...
Example Output: Positive

Example Input: I got this book because I was writing a research paper on palmistry. Out of the five books and two web sites I used as sources, this one was the most informative. Some of the books were witten as if they were trying to confuse the reader. This one had interseting anecdotes and asy to follow illustrations and discriptions.
Example Output:
Positive