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 that the professors advised believed the lawyers .
The lawyers believed the senator .

The presidents near the tourists stopped the senator .
The tourists stopped the presidents .

The secretaries in front of the doctor contacted the professors .

The professors contacted the secretaries .