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

Example Input: I bought this for a friend for her birthday and it didn't have a picture posted but from the description I figured it was the old version without the scary lady on the cover but it wasn't. Oh well.
Example Output: Positive

Example Input: I've noticed very little degrading of the sound, if at all, and this is rare in most extensions. The cord is thicker than usual for both the positive and negative polarities - a separate wire for each - and I'm quite pleased with this, will perhaps get another because of its thickness. I now have great headphone sound within a twenty-foot range - just what I was looking for. Even if you don't need 15-feet of cord, I would recommend this over the shorter 10 foot cords where the wiring is about half as thick and not likely to hold up over time...I subject all my electronics to heavy use. Plus, the best extensions for Grado headphones go for $40, and I'm quite satisfied saving over $30 by having this one.
Example Output: Positive

Example Input: In the book, author Bernstein notes that he writes 5 books a year. It shows. His books are poorly written: full of irritating grammar and spelling mistakes and lacking even the most basic story development.It's a shame Brooks wouldn't play the big NY publisher game--get an agent and find a talented ghost writer to work with on a memoir--or work with an established sports journalist on a well-researched, thoughtful biography. This book is just a collection of random thoughts from Brooks' friends and family. Many of them say interesting things, but without a persistent interviewer to ask the follow-up questions, few of the anecdotes yield much new insight.
Example Output:
Negative