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

Ex Input:
This book it simply one of the best science fiction stories ever written. It should be on the "must read" list for any sci-fi fan.

Ex Output:
Positive

Ex Input:
After trying three different sizes,I still couldn't find one that fit. I first ordered a medium and it wouldn't even come close to hooking so I went up to size to xlarge which was waaay to big, my last possible option would be a large and it was still huge, wish I would have sent it back but was just tired of the whole process and kept it. The hooks are a pain as well and it is way over priced.....there is a zippered option on amazon that is much cheaper.

Ex Output:
Negative

Ex Input:
Yes, all the reviews are correct: This is an excellent writer detailing some of the most gruesome killings of all time. It is the fastest 650 pages you will ever read, I gaurantee it.One note: This book might also be called "Vincent Bugliosi: The Man Who Brought Down Charles Manson And Lived to Tell About It." That is to say, Bugliosi is evidently proud (rightfully so) of his accomplishment as the lead prosecutor on the case. And he pretty much makes mincemeat out the intellect of the LAPD and the defense attorneys involved. But like any good prosecutor (and Bugliosi is most certainly that) he has quite a bit of evidence to back his charges of ineptitude. If I were Kanarek, or a Tate detective, I'd be pretty embarrassed knowing this book is an all-time bestseller.But who are we kidding, this is the definitive book on Tate-Labianca. A truly fantastic read.

Ex Output:
Positive