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.

[Q]: The actor saw the senator .
[A]: The senator saw the actor .


[Q]: The doctor admired the judge who the athlete helped .
[A]: The judge admired the doctor .


[Q]: The presidents introduced the artist that called the actor .
[A]:
The artist introduced the the actor .