TASK DEFINITION: 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.
PROBLEM: The presidents who the artist admired mentioned the secretaries .

SOLUTION: The secretaries mentioned the artist .

PROBLEM: The actor saw the senator .

SOLUTION: The senator saw the actor .

PROBLEM: The actor behind the doctor stopped the senators .

SOLUTION:
The senators stopped the actor .