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 senators behind the artist recommended the presidents .

SOLUTION: The presidents recommended the artist .

PROBLEM: The presidents contacted the doctor near the artist .

SOLUTION: The doctor contacted the presidents .

PROBLEM: The professors encouraged the secretary who the scientist advised .

SOLUTION:
The scientist encouraged the professors .