Definition: Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.
Input: If you know it all already, this is a good book for you to buy. If you are looking for grammar instruction, look elsewhere. This little book was written 75 years ago and it has things worth thinking about, but it is not a grammar book, or a book on speaking, or a book on writing. I just bought it and am delighted to rummage about in it. It's a GEM. It's worth the money by a mile and a half. I gave it two stars only to not be lost in the shuffle. Buyers often don't look at 50 rave shill reviews but they'll look to see who doesn't like and why. So maybe I caught some readers. This is a good buy IF you KNOW IT ALL. It's not instruction, it's food for thought.
Output:
Negative