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

Example Input: Felt great until it dug into my waist while sitting causing damage to my surgical site. Now I'm in pain with and without it on.
Example Output: Negative

Example Input: Do not buy this toy. If you are given this toy as a gift, return it for store credit. This is a flimsly and poorly designed stack of platic and paper. The secret door doesn't work, the elevator doesn't slide and toys get stuck in there. The suggested 10" batman doesn't work with the zip line, bungee or even the elevator. The add says "Using new adhesive technology, you can set up the Batcave on just about any wall" so they want us to glue this thing on to a wall.Please don't buy this toy.
Example Output: Negative

Example Input: I expected better than this poorly contrived story of murder and mystery from a well-seasoned author. The plot line lacked substance and the ending was poorly executed. The only reason I continued reading the story was in hopes that it would improve as I read. Boy, was I disappointed.
Example Output:
Negative