Problem: rockstar arithmetic

Code: rockstar+arithmetic/tails_1710395931

Nibbles version: 0.2 | 0.21 | 0.22 | 0.23 | 0.24 | 0.25 | 1.00

Format: Compact | Simple | +Type | Table | JSON | .nbl (DeBruijn) | .nbl (names)

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