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 that the scientist admired mentioned the presidents .
The presidents mentioned the doctor .

The tourist near the actor believed the athlete .
The athlete believed the actor .

The student called the scientist .

The scientist called the student .