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

Ex Input:
This product requires a stereo player in which the balance is turned totally to the left. Most auto systems have that capability. However if you have Dolby or SurroundSound, it can be difficult (and maybe impossible) to play the cassette without hearing two recordings at the same time. Unfortunately neither the packaging nor the website will warn you of the problem. You therefore should think before buying. Once you have opened the packaging you may be unable to return the product.

Ex Output:
Negative


Ex Input:
Great tunes dripping with latin up beat melodies and smooth syncopation. One track could have easily appeared in a 007 flick.Slick production and sound makes for great party music ; dancing or sitting ! "Oh yeah" will always turn an ear with or without the accompaning movie.......

Ex Output:
Positive


Ex Input:
Provides many yoga-based stretching exercises that are great for people who spend a lot of time working at a desk or some other sort of sedentary occupation.

Ex Output:

Positive