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 scientist in front of the secretary saw the presidents .

SOLUTION: The presidents saw the scientist .

PROBLEM: The authors contacted the lawyer .

SOLUTION: The lawyer contacted the authors .

PROBLEM: The scientist introduced the senators .

SOLUTION:
The senators introduced the scientist .

