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

Example Input: An exellent study of the German Airforce from the fall of Sevastopol in the Crimea to its failure at Stalingrad. Very well written, with a clear analysis of the events. Well worth the money and it belongs in every major collection on World War II's Eastern Front.
Example Output: Positive

Example Input: this product is awesome. it hide all your secrets. I would recommend this product to all women and men. I will buy product again.
Example Output: Positive

Example Input: I should have read the reviews before wasting $10 bucks at BB for this used dvd. I bought it for my wife. She wanted to see it but as I write this review I am watching it with her and we both think this movie is a fairy tale. Please, please...if this movie had any sense of reality I would be the first one to move to Italy. Enough! Read what others have said before me for more specific. I WANT MY MONEY BACK!
Example Output:
Negative