using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp19
{
    class Program
    {
        static void Main(string[] args)
        {
            char[] chararry = Console.ReadLine().ToCharArray();
            int sum = 0;

            for (int i = 0; i < chararry.Length; i++)
            {
                if (char.IsNumber(chararry[i]))
                {
                    sum += int.Parse(chararry[i].ToString());


                }
            }

            Console.WriteLine(sum);
            Console.ReadLine();
        }
    }
}