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 mechanic fixed the problem for the editor and he charged a thousand dollars .
Example Output: The, mechanic, he

Example Input: The janitor was good friends with the cleaner because he liked everyone .
Example Output: The, janitor, he

Example Input: The farmer offered apples to the housekeeper  because she might like them .
Example Output:
the, housekeeper, she