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

Example Input: This was my first purchase of a vibrator and was very disappointed. It was shipped very discreetly from Amazon directly, but it didn't work. I put in fresh batteries and it wouldn't turn on. I even tested the batteries, they were good, but this rabbit wasn't. Unfortunately, Amazon doesn't take returns on this type of personal product. I simple won't buy anything made by California Exotics again. I'll try one of the other brands next time.
Example Output: Negative

Example Input: Although this is a wonderful working power adapter, I don't believe it is the Macally Adapter that was advertised. I am however happy with it and would shop with this vendor again.Thank you.
Example Output: Positive

Example Input: Disappointing. Very. Nothing happens. Huxley pontificates. Spare me. Can see why he's only known for one book. Skip this one.
Example Output:
Negative