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 artist in front of the lawyer helped the judge .
The judge helped the artist .

The lawyers recognized the secretaries who introduced the actor .
The actor recognized the lawyers .

The professor encouraged the scientist .

The scientist encouraged the professor .