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

Example Input: My daughter loves her blocks. She will get them all out and look at each one until she finds her favorite. She likes to shake them and see what each one does. These are cute little blocks that have hours of imaginative playtime inside. They also have blunt corners, so no sharp edges like wood blocks for the safety of smaller children. The fact that they have the letters of the alphabet and a corresponding object inside makes them a great learning tool even for older tots. We have really enjoyed these and recommend them to our friends.
Example Output: Positive

Example 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.
Example Output: Positive

Example Input: Be careful. The box packing for this says it works with a PowerBook G4 or an iBook G3. It will not work for a iBook G4. The Amazon product page does not make that clear.
Example Output:
Negative