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 scientist saw the authors next to the manager .
answer:
The manager saw the scientist .


question:
The scientists helped the doctors in front of the authors .
answer:
The doctors helped the authors .


question:
The president helped the actor that mentioned the professor .
answer:

The actor helped the president .