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 presidents mentioned the scientists .

Ex Output:
The scientists mentioned the presidents .


Ex Input:
The presidents contacted the student near the doctors .

Ex Output:
The doctors contacted the presidents .


Ex Input:
The secretaries who helped the athlete saw the lawyers .

Ex Output:

The lawyers saw the secretaries .