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.

Ex Input:
The nurse sent the carpenter to the hospital because of his health .

Ex Output:
the, carpenter, his


Ex Input:
The developer built a website for the tailor because he is an expert in building websites .

Ex Output:
The, developer, he


Ex Input:
The assistant scanned documents for the analyst because she knows how to use the scan machine .

Ex Output:

The, assistant, she