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: This is not a children's toy, obviously. It does, however, make a great gift with a nice bottle of wine to any puzzle-loving adult in your life. I bought it for my sister who found it a bit of a challenge to get the bottle out, but liked that she wasn't able to solve it easily either. It provided just enough challenge, then we enjoyed the newly freed wine. She has it displayed by her wine area and everyone needs to try it out when they come over for dinner. A good conversation piece!
Solution:
Positive