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.

[EX Q]: The doctors called the author .
[EX A]: The author called the doctors .

[EX Q]: The professor who the scientist mentioned avoided the banker .
[EX A]: The banker avoided the scientist .

[EX Q]: The tourists that the artists saw avoided the professor .
[EX A]:
The artists avoided the tourists .