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: IRS Agent Bower:  Superman , Agent Bower , I.R.S. We 've been trying to contact you . We need your social security number .
Superman: I do n't have _ one _ .
IRS Agent Bower: Everyone has a social security number .
Superman: Well , I do n't .
IRS Agent Bower: I guess that explains why we ca n't locate any of your tax returns . It does n't appear you 've actually ever filed . That ca n't be , can it ? Superman a tax dodger ? Should we be looking under " S " for Super or " M " for Man ?

number