Given the task definition and input, reply with output. 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 Urkel: I 've never tried out for athletics before and the equipment list says that every guy should wear a cup .
Coach Westfield: That 's right .
Steve Urkel: Well , I did n't have _ one _ . So , is it all right with you ? I 'm wearing a Bart Simpson 's mug .
cup