using System;
using System.Collections.Generic;
namespace yuki783
{
    class Problem
    {

        public static List<string[]> getinputdata (){

            List<string[]> list_temp = new List<string[]>();
            string strdata = Console.ReadLine ();

            while (strdata!=null) {

                string[] s_temp = strdata.Split (' ');

                list_temp.Add (s_temp);

                strdata = Console.ReadLine ();

            }

            return list_temp;
        }


        public static void Main (string[] args)
        {
            List<string[]> list_result = new List<string[]>();
            list_result = getinputdata ();

            string s =list_result[0][0];

            int mysum=0;

            for (int i = 0; i < s.Length; i++)
            {

                if (char.IsNumber(s[i]))
                    {
                        mysum += int.Parse(s[i].ToString());
                    }
                }

                Console.Write(mysum);



        }
    }
}