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 presidents recognized the professors .
The professors recognized the presidents .

The tourist by the secretary introduced the students .
The students introduced the tourist .

The manager mentioned the judge .

The judge mentioned the manager .