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 scientist recommended the author .
The author recommended the scientist .

The managers by the artist mentioned the presidents .
The artist mentioned the managers .

The authors recognized the secretaries .

The secretaries recognized the authors .