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 doctor introduced the scientist who believed the athlete .
[EX A]: The athlete introduced the doctor .

[EX Q]: The authors behind the doctors advised the banker .
[EX A]: The banker advised the doctors .

[EX Q]: The presidents mentioned the tourists by the banker .
[EX A]:
The tourists mentioned the presidents .