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: By something else. This is the worst piece of machinery I have ever bought. Virtually impossible to cut any size tile on the diagonal. Typical imported junk!!!!!
Example Output: Negative

Example Input: I just got the adapter today, I plugged it into my iBook G4, and I was able to turn it on, but the battery doesn't charge, and after a minute or two, the screen dims and the laptop goes to sleep. Buyers beware! You might consider an official Apple adapter!
Example Output:
Negative