Problem: 81 digit number

Code: 81+digit+number/tails_1701234364

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)

+ (concat):[chr] 
    : (append):[[chr]] 
        ; (save):[[chr]] -->let( B:[[chr]] ) 
            `\ (special scans):[[chr]] 
                >> (tail):[chr] 
                    | (filter):[chr] 
                        @ (= fstLine):[chr] 
                        \ (char class):[chr] <--arg( A:chr ) 
                            $ (= A):chr 
                            d (isDigit):null 
                : (foldop: cons):null 
        >> (tail):[[chr]] 
            \ (reverse):[[chr]] 
                (implicit arg = B):[[chr]]