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

Input: Consider Input: Very intuitive in explaining the basic concepts and the fundamental and widely used methods in continuous-time finance. No deep background in math is required to have a good grasp of this book. I believe it is intuition rather than fancy skills that is important to build up interest and passion for studying a hard topic such as continuous-time finance.

Output: Positive

Input: Consider 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.

Output: Positive

Input: Consider Input: This product works exactly as advertised. Click the button and find out what the song is. The website isn't set up very well, and it's slow because of all the annoying flash stuff, but with broadband it's definitely usable.Unfortunately, it's only usable for the rest of September. Emarker.com is shutting down, and that makes the eMarker useless. Thus, the 1-star review. Current users are being offered a refund, but my guess is if you buy one now you won't get that.I'd write more detail, but I have to go print hardcopies of my eMarks. :(
Output: Negative