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 lawyers recognized the secretaries who introduced the actor .
The actor recognized the lawyers .

The doctors recognized the secretary .

The secretary recognized the doctors .