# code: http://golf.shinh.org/reveal.rb?Merry+Christmas+2021/darrenks_1640146267&nbb
# target Nibbles version: 0.2
# commenter version: 0.1.2.181

! #(zip with):[chr] 
    @ #(= fstLine):[chr] 
    `, #(range from 0):[int] <--arg( A:chr ) 
        ~ #(auto = infinity):auto 
    ~ #(zipop: by):null 
    ? #(if/else):chr <--arg( C:chr B:int ) 
        $ #(= C):chr 
        ? #(if/else):chr <--arg( D:chr ) 
            % #(modulus):int 
                / #(divide):int 
                    _ #(= B):int 
                    ~ #(auto = 2):auto 
                ~ #(auto = 2):auto 
            '.' #(char):chr <--arg( E:int ) 
            #(implicit arg = D):chr 
        #(implicit arg = C):chr