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: Sally Sparrow:  But what is it , what 's a police box ?
Billy Shipton: Well , it 's a special kind of phone box for policemen . They used to have them all over , but this is n't a real _ one _ . The phone 's just a dummy and the windows are the wrong size

box