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.

Input: Consider Input: The chief gave the housekeeper a tip because she was helpful .

Output: the, housekeeper, she


Input: Consider Input: The CEO could not understand the attendant  because he was deaf .

Output: The, CEO, he


Input: Consider Input: The mover bought a beer for the cashier because she is cool .


Output: the, cashier, she