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 professor mentioned the scientists near the actors .
The actors mentioned the professor .

The president who the doctor recommended introduced the tourist .
The doctor introduced the president .

The professors next to the judge admired the scientist .

The judge admired the professors .