Indicate a noun phrase from given statement which mentions a pronoun.

Example input: this book introduced shakespeare to ovid; it was a fine selection of his writing.
Example output: his writing
Example explanation: in this statement the pronoun is his and his writing is referring to the quote in the sentence using the pronoun
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 in.
A:
i couldn't get it in.