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

Input: Consider Input: Although good quality product, it doesn't fit my ear at all. None of the sizes fit comfortably or snug. I can't use it at all and just wasted my money.

Output: Negative

Input: Consider Input: I am a country and western fan in Memphis. This new Sony product is great! I meam really great. I don't have to remember songs I hear on the radio anymore. Definitely worth the $19.99 I paid. Get one!

Output: Positive

Input: Consider Input: When one is trying to get a basic overall grasp of Greek mythology, it can be an overwhelming and formidable subject, and one can be at a loss for the best place to start. Most books I've found either give too much detail too fast or else are hit-and-miss selections that don't give a very comprehensive introduction. If that's been your experience too, this book could be an excellent solution to your problem. It gives a highly readable thorough introduction without overwhelming you with details. As an introduction to or review of Greek mythology, it is therefore highly recommendable. Although probably aimed primarily at children, I suppose grown-ups too, if not already expert on the subject, won't find it too elementary.
Output: Positive