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: I have previously purchased a Ross Berstein book ("Gopher Hockey by the Hockey Gopher") and found that to be an entertaining read. Not so with this offeringAll Berstein seems to have done is find some of Herb's friends, turned on his tape recorder and then transcibe their comments, verbatim. The print is too small, the words and thoughts are redundant and the small paperback has the look and feel of a self-published work, which it is.The range of interviewees is tiny compared with the breadth of Brooks' life and all the interviews sound the same. There were a few pictures of young Herbie the player. Those are fairly interesting, but I found myself a little disappointed with this offering.
Solution:
Negative