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 actor contacted the athlete who called the tourists .

SOLUTION: The athlete contacted the the tourists .

PROBLEM: The doctors contacted the authors .

SOLUTION: The authors contacted the doctors .

PROBLEM: The actor called the doctor behind the athlete .

SOLUTION:
The doctor called the actor .