using System;

public class Program

{

    public static void Main()

    {

            Console.WriteLine("Nhap n");

            long n = long.Parse(Console.ReadLine());

            int dem = 0;

            while (n >= 10)

            {

                n /= 10; 

                dem++;

            }

            Console.WriteLine(dem+1);

            Console.ReadKey();

    }

}