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 doctors who the actor encouraged contacted the scientist .

SOLUTION: The scientist contacted the doctors .

PROBLEM: The tourist avoided the doctors .

SOLUTION: The doctors avoided the tourist .

PROBLEM: The actors called the presidents .

SOLUTION:
The presidents called the actors .