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 scientist contacted the senator .
Example Output: The senator contacted the scientist .

Example Input: The senator saw the professors by the students .
Example Output: The professors saw the students .

Example Input: The athletes thanked the president .
Example Output:
The president thanked the athletes .