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

Ex Input:
I am using this textbook in a class and it is a whopper. Wonderful pictures, easy to read, clear colors and understandable. I've been working in prisons for 5 years and this book makes a lot of sense. You ought to read their sections on women in prison and on probation. I loved the parts on geriatric prisoners (old cons) and the death penalty. And it is easy to read. More!

Ex Output:
Positive

Ex Input:
I ordered 3 of these. They are sturdy, comfortable, and stay inflated. The electric motor in each easily and quickly inflates and (almost) deflates them. The height also makes them feel more like a real bed.However, if you want to completely deflate them for storage, that can be a real trick. I could never deflate any of them completely, so in frustration I cut one open to see what the problem is. A design flaw allows an internal plastic flap to cover the deflation port when they are almost empty. The more you try to vacuum or squeeze out air, the tighter the flap seals the port, sealing in the last bit of air.Now I know, and there's nothing I can do about it, but I feel better after attacking one with scissors...

Ex Output:
Negative

Ex Input:
Enter one very unlikely hero who is trying to call national attention to the scourge. Randy Grim was young, hip, but crippled by panic attacks and phobias (of public places, parties, elevators, driving). After rescuing his first street dog, Bonnie, he couldn't look away. "How can I?" he asks. "Each one says, 'Don't leave me here.'" And so the man who must pop Xanax to walk through an airport refuses to leave a starving, terror-stricken German Shepherd on a dark, icy and stormy East St. Louis street, even when an threatening tenement resident has him on the business end of a gun.Journalist Melinda Roth puts a human, and animal, face on an ignored tragedy playing out in our cities. She gives us beautifully wrought, but too few, scenes of redemption.

Ex Output:
Positive