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 doctor saw the lawyers .
The lawyers saw the doctor .

The judges that called the author saw the artist .
The author saw the judges .

The professor that the senator avoided introduced the judges .

The judges introduced the senator .