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.

Ex Input:
The author helped the professor .

Ex Output:
The professor helped the author .


Ex Input:
The author contacted the actors who believed the lawyers .

Ex Output:
The lawyers contacted the author .


Ex Input:
The actor helped the artist .

Ex Output:

The artist helped the actor .