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 thanked the judges .
The judges thanked the professors .

The lawyers who the scientists encouraged introduced the senators .
The senators introduced the scientists .

The artists thanked the senator .

The senator thanked the artists .