using System;

namespace ConsoleApp11
{
    class Program
    {
        static void Main(string[] args)
        {
            int sum = 0;

            string S = Console.ReadLine();

            S.ToCharArray();

            for(int i = 0; i < S.Length; i++)
            {
                if(S[i] == '0' || S[i] == '1' || S[i] == '2' || S[i] == '3' || S[i] == '4' || S[i] == '5' || S[i] == '6' || S[i] == '7' || S[i] == '8' || S[i] == '9')
                {
                    string s = S[i].ToString();

                    int num = int.Parse(s);

                    sum += num;
                }
            }
            Console.WriteLine(sum);
        }
    }
}