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 farmer enjoyed getting a haircut from the hairdresser because she did a good job .

Ex Output:
the, hairdresser, she


Ex Input:
The laborer kicked the cashier because she said something bad .

Ex Output:
the, cashier, she


Ex Input:
The cook secretly stole the librarian "'s" books to increase his collection .

Ex Output:

The, cook, his