n7itro

import strutils, sequtils

var sum = 0

for line in lines "src/input.txt":
    let digits = line.filter isDigit
    sum += parseInt $digits[0] & $digits[^1]

echo sum

n7itro

import strutils

var grid = [
    [6, 0, 0, 0, 0, 4, 5, 3, 0],
    [8, 0, 0, 0, 5, 0, 0, 0, 9],
    [5, 9, 4, 0, 0, 0, 8, 2, 0],
    [0, 5, 0, 3, 0, 0, 0, 0, 0],
    [0, 3, 0, 0, 0, 0, 0, 8, 5],
    [0, 0, 2, 0, 0, 1, 0, 7, 0],
    [2, 0, 8, 0, 0, 0, 0, 5, 0],