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 professors introduced the artists .
The artists introduced the professors .

The doctor introduced the scientist who believed the athlete .
The athlete introduced the doctor .

The banker avoided the actor .

The actor avoided the banker .