You will be given a definition of a task first, then some input of the task.
In this task, you will use your knowledge about language (and common sense) to determine what element the marked number refers to. The numbers are marked with two underlines around them, like: _ number _. Your answer should be chosen from the given text, and should not contain other words.

Steve Rogers: I do n't remember giving you a key .
Nick Fury: You really think I 'd need _ one _ ? My wife kicked me out .
Steve Rogers: Did n't know you were married .
Nick Fury: There are a lot of things you do n't know about me .
Steve Rogers: I know , Nick . That 's the problem .
Nick Fury: I 'm sorry to have do this , but I had no place else to crash .
Steve Rogers: Who else knows about your wife ?
Nick Fury: Just ... my friends .
Steve Rogers: Is that what we are ?
Nick Fury: That 's up to you .
Output:
key