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 janitor cleaned the librarian "'s" room and he asked for a tip .
Example Output: The, janitor, he

Example Input: The lawyer yelled at the hairdresser because he was mad .
Example Output: The, lawyer, he

Example Input: The mechanic hired the assistant because she performed the best during the interview .
Example Output:
the, assistant, she