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 professors recognized the lawyers who contacted the doctor .
The lawyers recognized the professors .

The doctor in front of the athlete thanked the tourists .
The tourists thanked the doctor .

The artist contacted the lawyers .

The lawyers contacted the artist .