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

Ex Input:
I have had the charger for more than two years. It charges AA batteries just fine, but has a huge problem securing smaller AAA batteries. To charge the smaller batteries you need to flip down the little button at the positive end. In the beginning one of the four AAA batteries would pop up, and now three out of the four won't hold. The problem is the flip mechanism became loose, and any horizontal pressure would push the buttons back up. What I have to do now is using duct tape and a segment of crayon, apply the crayon on the buttons, and wrap the tape around. You know how painful that is.

Ex Output:
Negative


Ex Input:
Considering how much bad music is out there these days, this was nice to come across. Covers a wide range of topics and moods, musicianship is pretty good. I'd recommend it to just about anyone. My tastes are usually heavier and more progressive - Rush, Dream Theater, Iron Maiden, Queensryche. But I like this disc too.

Ex Output:
Positive


Ex Input:
It's pretty awesome for such a price! It definitely gives you great posture, I was sitting up straight like no other! although i wish they could improve on the rubber smell otherwise it's wonderful!^^^^^ was my review when i had it for 15-20 days, now-- after ordering it on Jan, 21, 2012-- it's SO useless. I've washed it with care, it smells like rubber, and it's pretty nasty. I'd rather pay $$$ and buy something that works the way it should.

Ex Output:

Negative