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 lawyers behind the author saw the student .
The student saw the author .

The judges contacted the doctor that saw the bankers .
The doctor contacted the judges .

The athlete called the authors that the banker mentioned .

The authors called the banker .