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

Ex Input:
just for the record: last day off my vacation in mexico and i dived into the Carraibean with my digital camera into my pocket :) (don't ask why) and althogh the camera is now mearly scrap (pentax optio s) the memory card works fine and i didn't lost any of my vacation photos with would have been a lot worse - so SD cards are water proof and salt water proof :)

Ex Output:
Positive


Ex Input:
The adapter worked fine for my power book g4 for a few months and then it broke. Nothing physically happened to the adapter for it to break, but suddenly it just wouldn't charge any more. What's interesting is that the blue light on the brick goes on when plugged in to a power source, but if I plug the cable that attaches the computer to the brick in, the light goes out and it doesn't charge.

Ex Output:
Negative


Ex Input:
This volume is a major contribution to the history of the Luftwaffe during the Russo-Germano war. "Stopped at Stalingrad" is also a richly drawn study of the most important air campaigns in the Eastern Front. Written in an accessible style this volume will be welcomed by anyone with an interest in the WWII. I was very pleasantly surprised by the book and also the quality of its contents. The author did a masterful job of research. Joel Hayward draws on diaries of both key commanders and regular airmen. He also shows that the poorly conceived strategies of Hitler and his buffoon, Goering, dommed the efforts of men such von Manstein, Milch and Wolfram von Richthofen (an outstanding soldier) to come to grips with an impossible situation. I heartily recommended this book.

Ex Output:

Positive