using System;

using System.Text.RegularExpressions;

using System.Linq;

public class Program

{

    public static void Main()

    {

        //input alphanumeric string

        String str = "0ut5yst3m5";

​

        //Function call

        Console.WriteLine(calculateSum(str));

    }

    public static int calculateSum(String str)

    {

        int sum = 0;

        string[] result = Regex.Split(str, @"\d+");

        return sum = result.Sum();

    }

​

}