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

Example Input: I was very excited to buy this scanner and was pleased with its size and weight. However, if you have a Vista operating system, like I do, IT WILL NOT WORK! The company told me that they stopped selling this product over a year ago and there are no driver updates available for this product. If you have an older computer and an older operating system this product might work for you. But as for me it was a waste of money!
Example Output: Negative

Example 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.
Example Output: Positive

Example Input: I love the way Elizabeth Winthrop describes his emotions about Mrs. Phillips leaving. It was exiting and I couldn't put it down!
Example Output:
Positive