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 believed the artists .
The artists believed the judge .

The senator who the artist introduced helped the student .
The artist helped the senator .

The athlete that the students stopped mentioned the scientists .

The scientists mentioned the students .