Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.
Q: The great thing about this book is it works as a nonfiction book, if you're a believer and as a book of fiction, if you're a nonbeliever.If you believe in UFO's and monsters, the interviews with the people sound very sincere and convincing.If you don't believe in the subject, the book reads like a good horror novel with a tragic ending which is based on a true event
A:
Positive