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

Input: Consider Input: Where to start I have had this for 10 years and it is still ticking that alone is a tesament to how well the thing works. Over that ten years It has traveled with me to over a third of the world. This is to include half a tour in Iraq. It has been dropped and has been trough airport security more times than most people. Because of this I have never had a reason to buy an Ipod. And to be honest for music I would rather use this. Only reason that I own anything like an Ipod is that its my Iphone. So I think that the Xtra is by far the one of the best mp3 player made.

Output: Positive

Input: Consider Input: If you are not in really good shape this is a great product to get ready for P90X. It does get kind of boring because you are doing the same workouts every other day, but they do work. It is only about 30 mins but it is amazing how well it works.

Output: Positive

Input: Consider Input: Interesting and informative book! This book is helpful for all diabetics--even those who are very knowledgeable about diabetes. There's always something more to learn about this disease. The diet is very restrictive and challenging to follow. But, a person's health does win out ultimately.
Output: Positive