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 in front of the lawyers stopped the professors .
The professors stopped the judge .

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

The actor recognized the professors .

The professors recognized the actor .