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: Harold Finch:  Annie was very careful not to leave any clues as to her and Riley 's meeting place , but ... maybe there is _ one _ . Her laptop wallpaper is a view of the city from a photo she took .
John Reese: Okay .
Harold Finch: By measuring the alignment and relative size of the key buildings in the photo , I was able to determine the geographical coordinates of the spot where it was taken , approximately 50 feet above sea level .
John Reese: Great , now does any of that voodoo produce an address ?
Harold Finch: 460 Eckford . And it 's trigonometry .

clues