package com.company;
import java.util.Scanner;
public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner (System.in);
        int a = 0;
        int sum = 0;
        int с = 0;
        String s = sc.nextLine();
        for (int i = 0; i < s.length() ; i++) {
            if ((s.charAt(i) >= '0') && (s.charAt(i) <= '9')) {
                while ((s.charAt(i) >= '0') && (s.charAt(i) <= '9') && (i < s.length())) {
                    a *= 10;
                    с = s.charAt(i) - '0';
                    a += с;
                    i++;
                }
                sum += a;
                a = 0;
            }
        }
        System.out.println(sum);

    }
}