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 called the senators admired the athletes .

SOLUTION: The senators admired the doctors .

PROBLEM: The tourist contacted the lawyer .

SOLUTION: The lawyer contacted the tourist .

PROBLEM: The scientist introduced the senator in front of the professor .

SOLUTION:
The senator introduced the scientist .