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.
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Question: The professor by the artists advised the secretaries .

Answer: The secretaries advised the professor .


Question: The scientist stopped the secretary .

Answer: The secretary stopped the scientist .


Question: The author encouraged the president that the doctors called .

Answer:
The president encouraged the doctors .