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 analyst offered free financial advice to the nurse but she did not accept it .
Example Output: the, nurse, she

Example Input: The salesperson hated the accountant because he hated all the customers .
Example Output: The, salesperson, he

Example Input: The physician wrote a letter to the writer because he was a fan of one of the writer "'s" books .
Example Output:
The, physician, he