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.

Input: Consider Input: The artist by the tourist encouraged the author .

Output: The author encouraged the artist .


Input: Consider Input: The student mentioned the doctor .

Output: The doctor mentioned the student .


Input: Consider Input: The president contacted the professors that stopped the doctors .


Output: The doctors contacted the president .