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 doctors who the actor encouraged contacted the scientist .
The scientist contacted the doctors .

The student that supported the doctors introduced the actors .
The actors introduced the student .

The presidents introduced the athlete .

The athlete introduced the presidents .