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

Ex Input:
I've bought several air beds from various manufacturers. I bought one identical to this one 1 1/2 years ago. It was comfortable but lost air after 3 months. I justified this as the user may have not taken care. However, I now believe its the brand. This one would not inflate at all. I will not buy this brand again. I've had great life from a better brands.

Ex Output:
Negative


Ex Input:
All the features are nice, TV Guide worked (note that browsing and setting recording preferences is very SLOW), BUT when the TV Guide is downloading (all the time) or you are recording / playing from the hard drive you constantly hear a grinding sound from the hard drive. These guys must have used a cheap hard drive or something. I have the Amazon return slip on my desk......

Ex Output:
Negative


Ex Input:
3/4 of this book is where to shop, with locations noted in Chicago, Houston, Florence, Milan, NYC, Vienna, etc (but not Beijing, Shanghai or Hong Kong). The rest is spoiled by a pompous, overbearing style that makes it unreadable.

Ex Output:

Negative