using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;
class Program
{
    static int NN => int.Parse(ReadLine());
    static long[] NList => ReadLine().Split().Select(long.Parse).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var s = ReadLine();
        for (var i = 0; i <= s.Length; ++i)
        {
            var t1 = s.ToList();
            var t2 = s.Take(i).Reverse();
            t1.AddRange(t2);
            if (IsPalindrome(t1))
            {
                WriteLine(string.Concat(t1));
                return;
            }
        }
    }
    static bool IsPalindrome(List<char> s)
    {
        for (var i = 0; i < s.Count; ++i)
        {
            var j = s.Count - i - 1;
            if (i >= j) break;
            if (s[i] != s[j]) return false;
        }
        return true;
    }
}