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 professor that the lawyers thanked introduced the presidents .
The lawyers introduced the professor .

The senator by the artists helped the managers .
The managers helped the senator .

The doctors stopped the actors who mentioned the artists .

The actors stopped the the artists .