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

Example Input: My husband and I were not able to attend a birthing class, so the doctor suggested we rent/buy a video. We decided on this one, and although the 'teacher' was a bit corny it was helpful. I especially liked that you could fast forward and skip parts! All in all it was a worthwhile purchase and proved helpful to us both.
Example Output: Positive

Example Input: It's pretty nice and comes with a little book with interesting proverbs too. I'm not sure if it really helps to relieve stress but it's makes a fun distraction once in a while. The only complaint is when other people play around with it, they always spill sand out the box..
Example Output: Positive

Example Input: the kit doesnt even fit the heater outlet vent on the 75K btu model. half the parts you wont need, just go to a hardware store & buy the ones you need for half the price.
Example Output:
Negative