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 secretaries near the athletes contacted the author .
The author contacted the secretaries .

The tourists saw the senator behind the secretary .
The secretary saw the tourists .

The president thanked the lawyers who the actors stopped .

The lawyers thanked the president .