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

Now, solve this: After about 3 months things started going down hill really fast. After leaving it in the car on a summer day something went wrong with the with the power saver. I'd charge it over night and the next morning it would be dead. I'd listen to it for 5 minutes, turn it off, then turn it back on and it would be at half power. Recently the screen broke. That just gave me a good reason to get rid of it.Trust me, keep looking.
Solution:
Negative