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

Example Input: I was expecting to read a book about the Amish. What I read instead was a very self centered book about a woman searching, rather blindly, I felt, for herself.She had very little in the way of insight into Amish life, even after spending a period of time with them. And her inability to get outside of her own head/her own life was not terribly interesting to read.For someone who always longed to be a 'star,' I am sure publishing a book was quite a thrill for her. Shame she used the Amish as a platform for her own ego.
Example Output: Negative

Example Input: Purchased from We Sell Bulk here on Amazon and received the item much faster than predicted delivery date - I only say that because there's always a list and it's often difficult to pick which seller is the one to go with. Anyhow, the battery came in original and undamaged Canon packaging (looks just like the images available in product description). I was not about to buy the cheap knockoffs and was worried that the one I ordered would be any different than the one that came with the camera (damaged item or store return). Well, after a couple charges and hundreds of pictures, I can say that this battery is exactly the same as our original. It lasts just as long and charges in the same amount of time. Our camera is fairly new so it was a fair comparison - one battery wasn't all that much older than the other.Email me with questions: mister_mr_d@hotmail.com
Example Output: Positive

Example Input: The first edition came out in 1998 and, six years on, this work has not been surpassed for its importance as an analysis of WWII joint warfighting, the Luftwaffe's way of war, airpower in the Crimea, airpower in the Caucasus, airpower at Stalingrad, and naturally the Stalingrad airlift itself.The reasons for this book's immediate "classic" status are easy to pick: totally accurate citing of hundreds of never-before-used sources in several languages drawn from major archives; a highly original approach to the writing of campaign histories; a clear argument; a fair and balanced approach; no Wehrmacht-devotee comments or tone (all too common I'm afraid); a wonderfully readable writing style; and precise footnotes that help the reader to determine the reliability of all claims or statements.A true model of a WWII campaign analysis. VERY highly recommended!
Example Output:
Positive