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 lawyer in front of the judge believed the presidents .
The presidents believed the lawyer .

The presidents helped the scientists .
The scientists helped the presidents .

The actor contacted the student behind the managers .

The student contacted the actor .