Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.
Example: I've read this book with much expectation, it was very boring all through out the book
Example solution: Negative
Example explanation: Review writer does not like the book because it was boring, therefore it is a negative review.

Problem: This charger is just what I needed to replace my Apple charger and it costs a whole lot less. The only recommendation is that you make sure to plug it into a surge protector as there is no third-prong ground on it.
Solution: Positive