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: the user changed his password from grwqwu8jyc toÂ willow-towered canopy huntertropic wrestles as it was easy to remember.
Example output: his, it
Example explanation: In this statement, 'it' is the pronoun used for password, and 'his' is used for the user.
Q: 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.
A:
i, it