In this task, you will be given a sentence, and you need to identify the set of coreference words. Coreferences are generally a set of words in the text that refer to the same person or thing. Your output set of coreference words must be strictly present in the given input sentence. Do not use any outside knowledge to create the set of coreference words. If there is a 'the' article before the person or thing you should include 'the' as well. Please separate the coreference words by commas in the output.

The guard saved the editor from the criminals because he was on duty .
The, guard, he

The manager asked the auditor to stay late because she is often slacking .
the, auditor, she

The CEO reminded the housekeeper to sweep up because he liked to tell people what to do .

The, CEO, he