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 senator called the athlete .
Example Output: The athlete called the senator .

Example Input: The secretaries introduced the author .
Example Output: The author introduced the secretaries .

Example Input: The author mentioned the secretary .
Example Output:
The secretary mentioned the author .