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 judge saw the senators by the author .
The author saw the judge .

The artist called the actors near the doctors .
The actors called the artist .

The scientists believed the tourists who the students saw .

The students believed the scientists .