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 artists mentioned the secretary .
The secretary mentioned the artists .

The secretary called the authors that the banker contacted .
The banker called the secretary .

The professor that the lawyers thanked introduced the presidents .

The lawyers introduced the professor .