TASK DEFINITION: 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.
PROBLEM: The librarian helped the CEO to find the book because he asked to .

SOLUTION: the, CEO, he

PROBLEM: The mover hired the accountant because he wanted to balance his finances .

SOLUTION: The, mover, he, his

PROBLEM: The mover told the teacher that she needs to be more patient with the kids .

SOLUTION:
the, teacher, she