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 presidents stopped the artist who the bankers contacted .
Example Output: The artist stopped the bankers .

Example Input: The artists who encouraged the scientists introduced the actor .
Example Output: The actor introduced the artists .

Example Input: The athlete who the doctors supported helped the professors .
Example Output:
The professors helped the doctors .