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

Example Input: I like the book Castle In the Attic because it was very adventurous. My favorite part in the book was when Mrs.Philips gave William a gift. Do you know what the gift was? Can you figure out what it is? I recommend this book because Castle In the Attic is a very exciting novel to read.
Example Output: Positive

Example Input: Last year I found this book and once I opened it I could not put it down. Bugliosi is excellent at bringing the details to life on the page. Not only do we get a first hand account of the trial, but he also explains much of the legal process in very clear and understandable terminology. I am now a fan of his work and will be reading everything I can of his.
Example Output: Positive

Example Input: What can I say that hasn't been said already? This is a classic....My 4 yr old granddaughter saw it for the first time and fell in love with Snoopy.
Example Output:
Positive