instruction:
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.
question:
The student saw the doctor .
answer:
The doctor saw the student .


question:
The professor mentioned the scientists near the actors .
answer:
The actors mentioned the professor .


question:
The artist mentioned the professors .
answer:

The professors mentioned the artist .