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 students admired the doctor .
The doctor admired the students .

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

The president thanked the actors next to the doctors .

The actors thanked the president .