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.

Example Input: The artist called the president by the bankers .
Example Output: The president called the artist .

Example Input: The artist in front of the lawyer helped the judge .
Example Output: The judge helped the artist .

Example Input: The scientist helped the student by the author .
Example Output:
The student helped the author .