I think it was javascript, in that case:

var surname = {A: 'Analogue', B: 'Bomb', C: 'Catalyst' ...}

it's surname not surName

Thanks for modifying your language :)

I'm assuming you're using Python. Python is a case-sensitive language. surName and SURNAME are two seperate names (variables, as you'd call them). The error you're getting hints at that.
The description states that the names of the preloaded dictionaries are SURNAME and FIRST_NAME.