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.

Example Input: bob collapsed on the sidewalk. soon he saw carl coming to help. he was very concerned.
Example Output: he

Example Input: they broadcast an announcement, but a subway came into the station and i couldn't hear over it .
Example Output: they, i, it

Example Input: i was trying to open the lock with the key, but someone had filled the keyhole with chewing gum, and i couldn't get it out.
Example Output:
i, it