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

Input: Consider Input: This book is not for everyone. It is extremely scary and disturbing. At the same time, it is a fascinating look at the police work and prosecution that brought the murderous Manson Family to justice. The book is hard to put down; the in depth discussion on presenting a criminal case in court and developing evidence to support the case is outstanding. The main complaint is that the book is a few hundred pages too long. The author seems a little too self-promoting, but then again he did get a prosecution on one of the biggest murders in history.

Output: Positive

Input: Consider Input: I've heard it said that this is Kerouac's greatest novel. I still say that honor is held by On the Road, but this book is just as good. And it is his most spiritual novel. Kerouac combines his talent at writing with his philosophy of life and what you have is a powerful tool to enlightenment. This book should be read on at least two levels, as a work of great literature and as a theological tool. I can't recommend it enough.

Output: Positive

Input: Consider Input: I'd only read the first three Odd Thomas books of Koontz's, but thought I'd try Frankenstein, because the review on Amazon said it was not a rehash of the old tale. And, it wasn't. It's a refreshing twist on the resurfacing of the madman (he was never destroyed, and actually resents that Shelley woman's story), but with a clean dash of Aldous Huxley's Brave New World, a pinch of James Lee Burke's detective angle, all with a flavor of hi-test horror. I'm starting on Vol 2 tonight!
Output: Positive