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 presidents stopped the artist who the bankers contacted .
answer:
The artist stopped the bankers .


question:
The professor by the artists advised the secretaries .
answer:
The secretaries advised the professor .


question:
The lawyer called the senator in front of the president .
answer:

The senator called the lawyer .