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.

The senator thanked the judges who supported the president .
The president thanked the senator .

The author who the doctor thanked supported the professor .
The professor supported the author .

The senator behind the athlete saw the student .

The athlete saw the senator .