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.

Example Input: The professor called the secretaries .
Example Output: The secretaries called the professor .

Example Input: The scientists helped the doctors in front of the authors .
Example Output: The doctors helped the authors .

Example Input: The judge saw the professor who mentioned the student .
Example Output:
The professor saw the judge .