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 actors introduced the secretaries .
[EX A]: The secretaries introduced the actors .

[EX Q]: The authors that the tourists mentioned helped the secretary .
[EX A]: The secretary helped the tourists .

[EX Q]: The actor thanked the doctor .
[EX A]:
The doctor thanked the actor .