You will be given a definition of a task first, then some input of the task.
You are given a review of Amazon's food products. Your task is to divide them into two classes: negative or positive, depending on the content of the review.

This stuff is great because it's low glycemic. Substitute this to sugar and you'll be doing your body a great favor. This size is economical and shipping is fast, too. I got mine very soon.
Output:
Positive