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.

Mr. Cuthbert Rumbold: Oh , Miss Thorpe , where 's the maintenance file ?
Miss Thorpe: You mean the _ one _ marked ' Decoration ' ?
Mr. Cuthbert Rumbold: Yes .
Miss Thorpe: I filed it yesterday under ' A ' .
Mr. Cuthbert Rumbold: Under ' A ' ?
Miss Thorpe: Yes , I file most things under ' A ' .
Mr. Cuthbert Rumbold: I do n't quite follow .
Miss Thorpe: Well , A letter , A sales report , A customer 's complaint .
Captain Stephen Peacock: A difficult way of finding anything .
Output:
file