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 auditor caught the developer cheating because she discovered the key documents .
Example Output: The, auditor, she

Example Input: The driver transported the housekeeper to the job because she was beautiful .
Example Output: the, housekeeper, she

Example Input: The librarian helped the CEO to find the book because he asked to .
Example Output:
the, CEO, he