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 author believed the artist .
The artist believed the author .

The scientist that the tourists mentioned supported the secretary .
The secretary supported the scientist .

The athlete helped the secretary that the lawyers mentioned .

The secretary helped the athlete .