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 senators called the judges who contacted the doctor .
answer:
The doctor called the senators .


question:
The judges saw the artist .
answer:
The artist saw the judges .


question:
The artist called the senator .
answer:

The senator called the artist .