# code: http://golf.shinh.org/reveal.rb?rockstar+arithmetic/tails_1710395931&nbb
# target Nibbles version: 1.00
# commenter version: 0.1.2.181

?, #(if/else (lazy list)):[chr] 
    | #(filter):[[chr]] 
        ; #(save):[[chr]] 
            % #(split (remove empties)):[[chr]] 
                fstLine #(@):[chr] 
                " + " #(string):[chr] 
        sets A 
        ~ #(not):null 
        \B 
        | #(filter):[chr] 
            B #($):[chr] 
            \C 
            \ #(char class):[chr] 
                C #($):chr 
                A #(not.isAlpha):null 
    \D 
    / #(foldr1):[chr] 
        D #($):[[chr]] 
        \F E 
        F #($):[chr] 
    + #(sum):int 
        . #(map):[int] 
            A #($):[[chr]] 
            \G 
            `* #(product):int 
                . #(map):[int] 
                    % #(split (remove empties)):[[chr]] 
                        G #($):[chr] 
                        "*" #(string):[chr] 
                    \H 
                    `r #(read int):int 
                        H #($):[chr]