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 author stopped the actor .
[EX A]: The actor stopped the author .

[EX Q]: The artist behind the lawyer saw the professor .
[EX A]: The professor saw the lawyer .

[EX Q]: The professors who the author encouraged thanked the scientists .
[EX A]:
The scientists thanked the professors .