You will be given a definition of a task first, then some input of the task.
In this 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.

I've tried several of the "economy" non-Kohler branded spray heads of this type. These Kohler spray heads are superior. We have very hard water, and for some reason the hard water causes problems with cheap heads much faster.
Output:
positive