instruction:
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.
question:
The managers contacted the presidents who encouraged the students .
answer:
The presidents contacted the the students .


question:
The managers that the secretary recognized advised the scientists .
answer:
The scientists advised the secretary .


question:
The presidents in front of the author introduced the lawyer .
answer:

The author introduced the presidents .