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 senators contacted the scientist .

SOLUTION: The scientist contacted the senators .

PROBLEM: The senator who the artist introduced helped the student .

SOLUTION: The artist helped the senator .

PROBLEM: The senators helped the presidents who the professor supported .

SOLUTION:
The professor helped the senators .