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

Ex Input:
I am anxiously awaiting the arrival of my CD. I was at the concert in Atlanta and was mesmerized during the entire show. It was so surreal..to be in the company of Barbra and Il Divo. I know the CD will be great. It will be the first thing loaded in my car. And, it will probably stay in there for quite a while. There is and will be no other Barbra. I only wish she would tour more often.

Ex Output:
Positive

Ex Input:
Very intuitive in explaining the basic concepts and the fundamental and widely used methods in continuous-time finance. No deep background in math is required to have a good grasp of this book. I believe it is intuition rather than fancy skills that is important to build up interest and passion for studying a hard topic such as continuous-time finance.

Ex Output:
Positive

Ex Input:
This toy was not that difficult to put together, but we have to put it back together each time my son plays with it. The set is always falling apart. The elevator broke after the first day. My friend bought this for her son as well, and she is just as frustrated as we are. I would not recommend buying this unless you have hours to spare re-assembly it and keeping up with all the parts that contiunally fall off it. [...]

Ex Output:
Negative