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 author avoided the bankers .
The bankers avoided the author .

The professor called the secretaries .
The secretaries called the professor .

The professors mentioned the scientist in front of the athletes .

The scientist mentioned the professors .