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: i was very excited when I saw the ad. I planned to buy a few of macro lenses, but ...the macro lens works only for the 1/4 inch distance :-(I cannot scan a business card or an article in a newspaper, but only a few charactersI really need a macro lens but for a few inches distance
Solution: Negative