using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication30
{
    class Program
    {
        static void Main(string[] args)
        {
            int count = 0;
            string str = Console.ReadLine();
            //int found = str.IndexOf('.');
            //Console.WriteLine(str.IndexOf('.'));
            //Console.WriteLine(str.LastIndexOf('.'));

            for (int i = str.IndexOf('.') + 1; i < str.LastIndexOf('.'); i++)
                count++;
            Console.WriteLine(count);
            Console.ReadLine();
        }
    }
}