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 tourist who advised the doctors avoided the presidents .
The doctors avoided the tourist .

The president thanked the author next to the artist .
The author thanked the artist .

The athlete introduced the secretary .

The secretary introduced the athlete .