8.3.15

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

namespace myloyorrr
{
    internal class Program
    {
        static bool f(string s)
        {
            bool h = true;
            for (int i = 0, j = s.Length - 1; i < s.Length / 2; i++, j--)
            {
                if (s[i] != s[j])
                {
                    h = false;
                    break;
                }
            }
            return h;
        }
        static void Main()
        {
            string[] a = Console.ReadLine().Split(' ', ',', '.', ':');
            for (int i = 0; i < a.Length; i++)
            {
                if (f(a[i]))
                {
                    Console.Write(a[i] + ' ');
                }
            }
        }
    }
}