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 who the doctor recommended introduced the tourist .
The doctor introduced the president .

The secretaries mentioned the lawyers who the students recommended .
The lawyers mentioned the secretaries .

The tourists admired the scientists .

The scientists admired the tourists .