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 senator saw the professors by the students .

Answer: The professors saw the students .


Question: The president behind the doctors called the secretary .

Answer: The secretary called the president .


Question: The judge contacted the professors near the doctors .

Answer:
The doctors contacted the judge .