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 artists mentioned the secretary .
answer:
The secretary mentioned the artists .


question:
The presidents contacted the student near the doctors .
answer:
The doctors contacted the presidents .


question:
The scientist saw the senators who the secretary introduced .
answer:

The senators saw the secretary .