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: Plain old charger that comes with the sd870is that I forgot the charger for when I went home for Christmas. Works just fine.The only thing that I can complain about is Amazon's shipping; I ordered it with 2-day shipping and since I ordered it the tracking said that it would arrive Dec. 22nd. Well, the 22nd came and went, then when I checked the tracking it said that it was on time and would arrive the 23rd. Wait, if it was on time then it would have arrived the 22nd...? OK... Thanks Amazon, so much for 2-day shipping...
Solution: Positive