using System;

public class Program

{

    public static void Main()

    {

        string s1 = "35 23 87 96";

        int sum = 0;

        string[] words = s1.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);

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

        {

            if(Char.IsDigit(words[i]))

            {

                sum += Convert.ToInt32(words[i].ToString());

            }

        }

        Console.WriteLine(sum);

    }

}