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 physician examined the auditor for sores because she complained .

SOLUTION: the, auditor, she

PROBLEM: The guard complimented the designer for meeting his expectations .

SOLUTION: The, guard, his

PROBLEM: The janitor cleaned the room for the designer and she is grateful .

SOLUTION:
the, designer, she