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 senators mentioned the student in front of the professor .
The student mentioned the senators .

The presidents near the scientists believed the secretaries .
The secretaries believed the presidents .

The authors near the president introduced the actor .

The actor introduced the authors .