08.Nilapdromes

namespace _08.Nilapdromes
{
    using System;
    using System.Collections.Generic;
    using System.Linq;

    public class Program
    {
        public static void Main()
        {
            string word = Console.ReadLine().ToLower();

            while (word != "end")
            {
                string frontBorder = string.Empty;
                string backBorder = string.Empty;
                string border = string.Empty;

                for (int i = 0; i < word.Length/2; i++)
                {
                    frontBorder = frontBorder + word[0 + i];
                    backBorder = word[word.Length - 1 - i] + backBorder;
                    if (frontBorder == backBorder)
                    {
                        border = frontBorder;
                    }
                }

                if (border.Length > 0)
                {
                    string core = word
                        .Substring(border.Length, word.Length - (border.Length * 2));
                    //string core = word.Replace(border, string.Empty);

                    if (core.Length > 0)
                    {
                        Console.WriteLine(core + border + core);
                    }
                }

             word = Console.ReadLine();
            }
        }
    }
}