Given the task definition, example input & output, solve the new input case.
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
Output: Negative
Review writer does not like the book because it was boring, therefore it is a negative review.

New input case for you: After reading this book, I felt like I was an expert on the how-to's of training retrievers. I have tried out many of these training techniques with my dog and have had fabulous success. And I could swear that my dog has spoken a word or two after several training sessions! I highly recommend this book for anyone interested in having a well-disciplined dog. A brilliant piece of work!
Output:
Positive