using System.Numerics;

public class Program
{
    public static void Main()
    {
        BigInteger num = BigInteger.Parse(Console.ReadLine() ?? string.Empty);
        //string[] str = (Console.ReadLine() ?? string.Empty).Trim().Split(' ');
        //string str = Console.ReadLine() ?? string.Empty;


        Console.WriteLine(num.ToString().Length - 1);

    }
}