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

Ex Input:
I was looking for a shower door that could open from either the left or the right and I did not want one to choose for me. This door ticks and fits all the right boxes in that department. I like the crystal glass effect too. It is very clear and allows a lot of light into the shower hub. It is frameless too which is what was asked for by the wife.Its sturdy quarter of an inch thick glass also is a nice feature. But most of all the pivot door is a feature I got on with too.

Ex Output:
Positive


Ex Input:
What a pleasure to read such a high-quality book... It introduces each of the islands in a colorful and vivid way. The book includes many pictures, and provides a fine insight into the culture and character of the islands and touches on history, people, travel, activities, sights, nature, and a lot more.However, if you are looking for a book with accurate travel information, e.g. hotels, restaurants, prices/dates, how to get there, etc., this book is on the weaker side. Use it together with the Frommer's Caribbean guide for a combination that is hard to beat. Despite this weakness, it's still a five star on my bookshelf.

Ex Output:
Positive


Ex Input:
I've had this product about 3 years now and use it everyday. I'm amazed at the quantity of music that I can put on it. I haven't used the video part of it, but, in a pinch have used it while DJing when my other equipment failed. I totally recommend this.

Ex Output:

Positive