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 tourist who advised the scientists recommended the bankers .
The scientists recommended the tourist .

The professors helped the doctor that the manager mentioned .
The doctor helped the manager .

The managers called the authors behind the artist .

The artist called the managers .