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 developer corrected the secretary because he better understood the problem .
Example Output: The, developer, he

Example Input: The mechanic charged the auditor one hundred dollars although she only had eighty dollars .
Example Output: the, auditor, she

Example Input: The farmer enjoyed getting a haircut from the hairdresser because she did a good job .
Example Output:
the, hairdresser, she