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 doctor mentioned the tourist .

SOLUTION: The tourist mentioned the doctor .

PROBLEM: The judge who the authors contacted recommended the students .

SOLUTION: The students recommended the judge .

PROBLEM: The professor stopped the scientist who mentioned the actors .

SOLUTION:
The scientist stopped the the actors .