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

Example Input: I was very excited to buy this scanner and was pleased with its size and weight. However, if you have a Vista operating system, like I do, IT WILL NOT WORK! The company told me that they stopped selling this product over a year ago and there are no driver updates available for this product. If you have an older computer and an older operating system this product might work for you. But as for me it was a waste of money!
Example Output: Negative

Example Input: I had placed a huge order for my children for christmas. I was so upset when my children got the movie and there was no disc at all. so my bad review is with the company not with Amazon since they were kind enough to fix this problem and send another movie free of charge and free of shipping!! Thak you!
Example Output: Negative

Example Input: These short curves are really a nice addition to your wooden railway system as they make it possible to create small and sharper turns than you can do with the normal curved track (33342). The downside of this track is that it may be a bit difficult for longer engines (like the mighty red battery-powered engine) to drive through the curves. However, if the tracks are laid without too many "bumps" at the connecting points the larger engines will manage to drive through it as well.
Example Output:
Positive