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 professors introduced the artists .

SOLUTION: The artists introduced the professors .

PROBLEM: The students called the lawyers .

SOLUTION: The lawyers called the students .

PROBLEM: The actors stopped the banker .

SOLUTION:
The banker stopped the actors .