# code: http://golf.shinh.org/reveal.rb?three+piece+puzzle/tails_1700550246&nbb
# target Nibbles version: 1.00
# commenter version: 0.1.2.181

+ #(concat):[chr] 
    + #(concat):[[chr]] 
        =~ #(group by (also sorts)):[[[chr]]] 
            % #(split (remove empties)):[[chr]] 
                fstLine #(@):[chr] 
                ~ #(auto = words):auto 
            \A 
            / #(foldr1):int 
                . #(map):[int] 
                    A #($):[chr] 
                    \B 
                    , #(length):int 
                        `% #(split list (keep empties)):[[chr]] 
                            fstLine #(;$):[chr] 
                            B #($):chr 
                \D C 
                - #(subtract):int 
                    #(implicit arg = D):int 
                    #(implicit arg = C):int