水

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

namespace _118A
{
    class Program
    {
        static void Main(string[] args)
        {
            char[] vow = new char[] { 'a', 'o', 'y', 'e', 'u', 'i' };
            Console.WriteLine(string.Join("", Console.ReadLine().Select(c => char.ToLower(c)).Where(c => !vow.Contains(c)).Select(c =>"." + c).ToArray()));
        }
    }
}