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.

The lawyers helped the professors by the athletes .
The professors helped the athletes .

The president encouraged the professor .
The professor encouraged the president .

The professors that the artists contacted saw the students .

The artists saw the professors .