Indicate all the pronouns (they, them, you, he, his, her, you, it, etc.) present in the given sentence. If there are multiple such pronouns in a sentence, then list them in the order of their first appearance in the given sentence. If a pronoun appears multiple times in a sentence, list it only once.

Ex Input:
the customer walked into the bank and stabbed one of the tellers. he was immediately taken to the police station.

Ex Output:
he


Ex Input:
it was a summer afternoon, and the dog was sitting in the middle of the lawn. after a while, it got up and moved to a spot under the tree, because it was cooler.

Ex Output:
it


Ex Input:
i took the water bottle out of the backpack so that it would be lighter.

Ex Output:
i, it