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 president next to the doctor thanked the scientist .
The scientist thanked the doctor .

The lawyer admired the doctors near the author .
The doctors admired the lawyer .

The actors introduced the athletes in front of the doctor .

The doctor introduced the actors .