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 scientists next to the professors thanked the artist .

SOLUTION: The artist thanked the professors .

PROBLEM: The tourist avoided the doctors .

SOLUTION: The doctors avoided the tourist .

PROBLEM: The scientist encouraged the president .

SOLUTION:
The president encouraged the scientist .