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 mentioned the tourist .
The tourist mentioned the doctor .

The students supported the tourist .
The tourist supported the students .

The tourist in front of the professors introduced the athletes .

The athletes introduced the tourist .