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 presidents introduced the artists who encouraged the actor .
The artists introduced the the actor .

The artists that thanked the judge helped the presidents .
The judge helped the artists .

The tourists helped the athlete near the secretary .

The athlete helped the tourists .