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

Example Input: This book was brand new when I received it. However, it did not arrive for 20 days after I ordered it.
Example Output: Negative

Example Input: I ordered 3 of these. They are sturdy, comfortable, and stay inflated. The electric motor in each easily and quickly inflates and (almost) deflates them. The height also makes them feel more like a real bed.However, if you want to completely deflate them for storage, that can be a real trick. I could never deflate any of them completely, so in frustration I cut one open to see what the problem is. A design flaw allows an internal plastic flap to cover the deflation port when they are almost empty. The more you try to vacuum or squeeze out air, the tighter the flap seals the port, sealing in the last bit of air.Now I know, and there's nothing I can do about it, but I feel better after attacking one with scissors...
Example Output: Negative

Example Input: This is a wonderful DVD to watch, especially for those who are having their first child. I watched this before my son was born, and had a completely natural birth because of it. This was MUCH better than the birthing class that we took at our local hospital. The woman who presents the information is a little goofy, but there is a lot of helpful information here!
Example Output:
Positive