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 professor behind the scientists helped the lawyer .

Output: The scientists helped the professor .


Input: Consider Input: The authors that the tourists mentioned helped the secretary .

Output: The secretary helped the tourists .


Input: Consider Input: The president helped the professors by the managers .


Output: The professors helped the president .