TASK DEFINITION: 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.
PROBLEM: The lawyers who the scientists encouraged introduced the senators .

SOLUTION: The senators introduced the scientists .

PROBLEM: The professors introduced the artists .

SOLUTION: The artists introduced the professors .

PROBLEM: The secretaries next to the students called the doctor .

SOLUTION:
The students called the secretaries .