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 scientist who the tourists helped thanked the actors .
[A]: The tourists thanked the scientist .


[Q]: The authors recognized the secretaries .
[A]: The secretaries recognized the authors .


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