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 doctor saw the lawyers .

Ex Output:
The lawyers saw the doctor .


Ex Input:
The tourists saw the senator behind the secretary .

Ex Output:
The secretary saw the tourists .


Ex Input:
The scientist in front of the secretary introduced the presidents .

Ex Output:

The presidents introduced the secretary .