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 lawyer contacted the author .
Example Output: The author contacted the lawyer .

Example Input: The professor that the lawyers thanked introduced the presidents .
Example Output: The lawyers introduced the professor .

Example Input: The professors introduced the manager .
Example Output:
The manager introduced the professors .