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 authors near the secretaries contacted the athletes .
The athletes contacted the authors .

The presidents next to the scientists saw the students .
The scientists saw the presidents .

The professors contacted the president .

The president contacted the professors .