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 sheriff asked the secretary to close the window because he was cold .

SOLUTION: The, sheriff, he

PROBLEM: The auditor bought the guard a gift because she is thankful .

SOLUTION: The, auditor, she

PROBLEM: The construction worker asked the nurse for an examination because he was injured .

SOLUTION:
The, worker, he