using System;

public class Program

{

    public static int num = 0;

    public static void Main()

    {

        Console.WriteLine(RecCount(8765));

        //RecExercise3

    }

    public static int RecCount(int no)

    {

        if (no <= 0)

            return 0;

        RecCount(no/10);

        //Console.WriteLine(no%10);

        return ++num;

​

    }

}