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.

[EX Q]: The lawyer helped the judges .
[EX A]: The judges helped the lawyer .

[EX Q]: The judge saw the senators by the author .
[EX A]: The author saw the judge .

[EX Q]: The lawyers introduced the professor .
[EX A]:
The professor introduced the lawyers .