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 supervisor berated the accountant for his poor behavior .
Example Output: The, supervisor, his

Example Input: The sheriff talked to the clerk because she could provide help with some paperwork .
Example Output: the, clerk, she

Example Input: The CEO reminded the housekeeper to sweep up because she often forget .
Example Output:
the, housekeeper, she