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 students that stopped the professor advised the president .
The president advised the professor .

The senators contacted the scientist .
The scientist contacted the senators .

The lawyers believed the secretaries .

The secretaries believed the lawyers .