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: Any problem listed in previous reviews, I encountered with mine. At which point I discovered one more weakness of this mp3 player.It does not fare well against a hammer.
Solution: Negative