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 construction worker hired the cleaner so he can focus only on the construction work .
Example Output: The, worker, he

Example Input: The manager asked the accountant for the books because he felt the work was wrong .
Example Output: The, manager, he

Example Input: The analyst consulted with the librarian because she knows a lot about books .
Example Output:
the, librarian, she