import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.io.StringReader;

public class Calibration {
  public static void main(String[] args) {
    String coor = """
        1abc2
        pqr3stu8vwx
        a1b2c3d4e5f
        treb7uchet
               """;

    int total = 0;
    try (
        // let's first remove all the spaced lines and go through char by char
        BufferedReader br = new BufferedReader(new FileReader("/home/ilyes/AdventOfCode/Trebuchet/Coordinates.txt"))) {
      // BufferedReader br = new BufferedReader(new StringReader(coor))) {
      String line;
      while ((line = br.readLine()) != null) {
        int first = -1;
        int last = -1;
        for (String c : line.split("")) {
          // check for digits
          if (Character.isDigit(c.charAt(0))) {
            if (first == -1) {
              // we add the first digit
              first = Integer.parseInt(c);
            }
            // we add the last digit
            last = Integer.parseInt(c);
          }
        }

        // let's combine the first and the last digits then we do the addition (12 + 38
        // + 15 + 77 = 142)
        first = first * 10;
        total += first + last;
        // System.out.println(first + "" + last);
        // the output would be
        // 12
        // 38
        // 15
        // 77 resulting in total of 142
      }
      System.out.println(total);
    } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
  }
}