Definition: 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.
Input: Alexis Castle:  So , according to the JPEG 's geotag , the photo was taken here , and this is the building you were coming out of .
Kate Beckett: Montreal Global Bank .
Richard Castle: What was I doing at a bank ?
Alexis Castle: Dad , the key ! The _ one _ sewn into your pants when they found you . What if ... the bank is where it came from ?
Richard Castle: A safe deposit box .
Alexis Castle: It 's the right size .
Richard Castle: We need to get up there . This is the break we 've been waiting for .
Kate Beckett: Okay , fine . We 'll go this weekend .
Richard Castle: We ca n't wait for the weekend . We got ta go now .
Kate Beckett: I 'm in the middle of a case .
Richard Castle: Fine . I 'll go . Montreal 's a short flight , I 'll be there and back in a couple of hours .
Kate Beckett: No ! Not after everything we 've been through . You 're not going alone .
Alexis Castle: She 's right , dad . You ca n't go by yourself . I 'll go with you .
Richard Castle: Yes . Yes , she 'll go with me .
Kate Beckett: We have no idea what 's out there . No idea who 's out there . That 's too risky .
Richard Castle: It 's Canada . How risky could it be ? And need I remind you , I 'm a grown man . I do n't need to ask your permission . That being said , please , please , please can I ... can I ... can I go ?
Kate Beckett: Okay , fine . But only because I know you 're not gon na do anything stupid if she 's with you . Do n't let him do anything stupid .
Alexis Castle: Promise .

key