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.

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

The manager who the senator encouraged avoided the actors .
The senator avoided the manager .

The lawyer in front of the professor called the actors .

The professor called the lawyer .