import std/[re, strutils]

var res = 0
var valid_digits = "one,two,three,four,five,six,seven,eight,nine".split(",")
var digits_rx = re("\\d|" & valid_digits.join("|"))

proc parseDigit(s: string): int =
    try:
        result = parseInt(s)
    except ValueError:
        result = valid_digits.find(s) + 1

for line in readFile("input_01.txt").splitLines:
    if line.strip.len > 0:
        var digits = findAll(line, digits_rx)
        var number = parseDigit(digits[0]) * 10 + parseDigit(digits[^1])
        res += number
        #echo $digits, $number

echo "Result: ", $res