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.

Example Input: The salesperson sold some books to the librarian because it was his job .
Example Output: The, salesperson, his

Example Input: The auditor bought the guard a gift because he is effective .
Example Output: the, guard, he

Example Input: The construction worker prayed for the tailor because he was faithful .
Example Output:
The, worker, he