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 manager behind the author thanked the artist .
The artist thanked the manager .

The manager who saw the doctors introduced the senator .
The senator introduced the manager .

The author saw the scientists that the artist helped .

The scientists saw the artist .