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 contacted the judges .
The judges contacted the professors .

The doctors next to the secretary avoided the presidents .
The presidents avoided the doctors .

The lawyers thanked the judges by the secretaries .

The secretaries thanked the lawyers .