Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.

Ex Input:
The book covers several generations, so with each generation you have to re-learn all the characters. It is difficult to keep track of who's who when every time you get to know the cast, 200 years suddenly pass and we're in the middle of a new crisis. I didn't read the whole series because of this -- it was obnoxious.

Ex Output:
Negative

Ex Input:
I've noticed very little degrading of the sound, if at all, and this is rare in most extensions. The cord is thicker than usual for both the positive and negative polarities - a separate wire for each - and I'm quite pleased with this, will perhaps get another because of its thickness. I now have great headphone sound within a twenty-foot range - just what I was looking for. Even if you don't need 15-feet of cord, I would recommend this over the shorter 10 foot cords where the wiring is about half as thick and not likely to hold up over time...I subject all my electronics to heavy use. Plus, the best extensions for Grado headphones go for $40, and I'm quite satisfied saving over $30 by having this one.

Ex Output:
Positive

Ex Input:
Wonderful book! Very few fans of Feehan's Dark series seem to realize that although this book is not part of the Dark series, is the children and children's children of this couple will tie in to the Dark series later. Bryon's lifemate will come from this line. But if you want to learn about what's going to happen in the future books in this series as well as the Dark series, then go to Feehan's web page. You can use any search engine to get to it. But this book really is wonderful! It can really stand on it's own! I can't wait for more from this author. The publishing company needs to publish her stuff quicker than this! Can't wait till Darius's story, Dark Fire! Feel free for anyone to e-mail with any questions! I'll sell you on these books!

Ex Output:
Positive