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.

[Q]: The presidents helped the scientists .
[A]: The scientists helped the presidents .


[Q]: The president saw the senators who the professors encouraged .
[A]: The senators saw the president .


[Q]: The banker behind the professor encouraged the lawyer .
[A]:
The lawyer encouraged the professor .