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:
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.

Ex Output:
i, it


Ex Input:
the sack of potatoes had been placed above the bag of flour, so it had to be moved first.

Ex Output:
it


Ex Input:
the city councilmen refused the demonstrators a permit because they feared violence.

Ex Output:
they