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 artist that believed the president called the professor .
[A]: The professor called the president .


[Q]: The artist contacted the judges .
[A]: The judges contacted the artist .


[Q]: The doctor stopped the judge .
[A]:
The judge stopped the doctor .