using System;

namespace yukicoder
{
    class Program
    {
        static void Main(string[] args)
        {
            string str = Console.ReadLine();
            string[] t = {"0","1","2", "3", "4", "5", "6", "7", "8", "9" };
            int ans = 0;
            for (int i=0;i<t.Length;i++)
            {
                    int num = str.IndexOf(t[i], 0);
                    if(num!=-1)
                    ans += int.Parse(str.Substring(num,1));
            }
            Console.WriteLine(ans.ToString());     
        }
    }
}