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 manager saw the scientists .
The scientists saw the manager .

The judge saw the professor who mentioned the student .
The professor saw the judge .

The tourist contacted the professors .

The professors contacted the tourist .