#!/usr/bin/env python3

# https://adventofcode.com/2023/day/1

import re


def get_lines(filename: str) -> list:
    with open(filename, "r") as file:
        return [line.strip() for line in file.readlines()]


def get_cal_val(line: str) -> int:
    found_first = False
    first = ""
    last = ""
    for test_char in line:
        if test_char.isdigit():
            if found_first:
                last = test_char
            else:
                first = test_char
                found_first = True
    if last == "":
        last = first
    return int(first + last)


def main():
    # lines = get_lines("test-input.txt")
    lines = get_lines("input.txt")
    sum_cal_val = 0
    for line in lines:
        sum_cal_val += get_cal_val(line)
    print(f"Part 1: The sum of all calibration values is {sum_cal_val}.")


if __name__ == '__main__':
    main()