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 author helped the professor .

Answer: The professor helped the author .


Question: The athlete stopped the artist .

Answer: The artist stopped the athlete .


Question: The judge thanked the scientists .

Answer:
The scientists thanked the judge .