StringLength

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

namespace ConsoleApplication7
{
    class Program
    {

        static void Main(string[] args)
        {
            string input = Console.ReadLine();
            Console.WriteLine(CheckFillString(input));
        }
       static string CheckFillString(string someString)
        {
            StringBuilder check = new StringBuilder();
            if (someString.Length >= 20)
            {
              for (int i = 0; i < 20; i++)
            {
                check.Append(someString[i]);
            }
            }
            else
            {
                for (int j = 0; j < someString.Length; j++)
                {
                    check.Append(someString[j]);
                }
                for (int p = 0; p < 20 - someString.Length; p++)
                {
                    check.Append("*");
                }
            }
            return check.ToString();
        }


    }
}