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 judge contacted the banker in front of the author .
The banker contacted the author .

The senator contacted the artist near the judges .
The artist contacted the senator .

The artist called the actor by the scientists .

The actor called the artist .