using System;
using System.Collections.Generic;

namespace Ex06TwentyChars
{
    class TwentyChars
    {
        static void Main()
        {
            try
            {
                string input = Console.ReadLine();
                if(input.Length>20) throw new ArgumentOutOfRangeException();
                if(input.Length<20)
                input = input.Insert(input.Length, new string('*', 20 - input.Length));
                Console.WriteLine(input);
            }
            catch (ArgumentOutOfRangeException)
            {
                Console.WriteLine("Error: String cannot exceed 20 symbols");
            }
        }
    }
}