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.

[EX Q]: The tourist thanked the scientist .
[EX A]: The scientist thanked the tourist .

[EX Q]: The scientist saw the authors next to the manager .
[EX A]: The manager saw the scientist .

[EX Q]: The artist that believed the president called the professor .
[EX A]:
The professor called the president .