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 artists thanked the president .
The president thanked the artists .

The secretary thanked the senators by the athlete .
The athlete thanked the secretary .

The students stopped the tourist that encouraged the lawyers .

The lawyers stopped the students .