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 doctors next to the secretary avoided the presidents .
The presidents avoided the doctors .

The authors behind the doctors advised the banker .
The banker advised the doctors .

The authors called the students who mentioned the banker .

The banker called the authors .