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 scientists saw the author that the senators avoided .
The author saw the senators .

The athletes in front of the artist called the judge .
The judge called the artist .

The student by the presidents encouraged the senators .

The senators encouraged the presidents .