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 president helped the secretary .
The secretary helped the president .

The tourist admired the students that the scientist recommended .
The students admired the scientist .

The author supported the artists who saw the tourists .

The artists supported the the tourists .