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

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

The artist stopped the author .

The author stopped the artist .