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 doctors called the author .
Example Output: The author called the doctors .

Example Input: The doctor who helped the tourists advised the professor .
Example Output: The professor advised the tourists .

Example Input: The judges introduced the doctor .
Example Output:
The doctor introduced the judges .