You will be given a definition of a task first, then some input of the task.
Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.

This Sony VCT-TK1 is by far the best pocket tripod for instant use. I take it out of my pocket, screw on my camcorder, and it is ready to instantly take videos or self pictures.(Incidently, I have a wide variety of other different pocket-type tripods with three small legs and adjustable ball pan and tilt, but I do not use them.)
Output:
Positive