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 doctors called the author .
answer:
The author called the doctors .


question:
The scientists next to the professors thanked the artist .
answer:
The artist thanked the professors .


question:
The actor thanked the banker .
answer:

The banker thanked the actor .