using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
using static System.Console;

public class hello{
    public static void Main(){   //yukikoder No.289 数字を全て足そう
                                           
        string str = ReadLine().Trim() ;
        str = Regex.Replace(str,"[^0-9]","");//文字配列（数字のみを抽出）
        var n = str.Select(x => Convert.ToInt32(x.ToString()));//char -> string -> int   
        
        //配列要素の総和
        WriteLine(n.Sum());
    }
}