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

Example Input: Easy to read yet scholarly. Great illustrations. Space in the margins for notes. Good chapter overviews and summaries. Nice T/F questions to prime the reader. Sources used appropriately. It is truly the ideal textbook.The format, layout, and writing style make this the text that other writers should follow.
Example Output: Positive

Example 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.
Example Output: Negative

Example Input: This CD only contains 2 songs, both of which are available on Madonna's first album. Definately only for those who can't stand not having any given Madonna cd for their expansive collection.
Example Output:
Negative