instruction:
In this task, you are given a premise sentence. Your task is to write a new sentence by substituting the subject and object (i.e., the input's subject should be output's object and vice versa.). The generated sentence must be fluent and shouldn't change the voice (i.e., passive or active) of the input.
question:
The professor encouraged the artist .
answer:
The artist encouraged the professor .


question:
The banker that the senator admired saw the tourist .
answer:
The tourist saw the banker .


question:
The scientists called the secretary that stopped the professor .
answer:

The professor called the scientists .