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 called the secretaries .

Answer: The secretaries called the professor .


Question: The artists that thanked the judge helped the presidents .

Answer: The judge helped the artists .


Question: The tourists thanked the doctor .

Answer:
The doctor thanked the tourists .