# code: http://golf.shinh.org/reveal.rb?Twelve/darrenks%28v0.23%29_1643071049&nbb
# target Nibbles version: 0.23
# commenter version: 0.1.2.181

. #(map):[chr] 
    hex #(to/from hex):[chr] 
        + #(add):int 
            * #(multiply):int 
                / #(divide):int 
                    ; #(save):int -->let( B:int ) 
                        + #(sum):int 
                            . #(map):[int] 
                                @ #(= fstLine):[chr] 
                                hex #(to/from hex):int <--arg( A:chr ) 
                                    $ #(= A):chr 
                    12 #(integer):int 
                4 #(integer):int 
            $ #(= B):int 
    `) #(to uppercase):chr <--arg( C:chr ) 
        $ #(= C):chr