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 author stopped the actor .
[A]: The actor stopped the author .


[Q]: The scientist contacted the senator .
[A]: The senator contacted the scientist .


[Q]: The actor called the president .
[A]:
The president called the actor .