using System;

using System.Text;

public class Program

{

    public static void Main()

    {

        string s1 ="tsst";

        char[] chs = s1.ToCharArray();

        bool isMatched = true;

        int halfLength = Math.Abs(chs.Length-1/2);

        for(int i = halfLength; i >=0;i--)

        {

            if(chs[i]!=chs[i * halfLength])

            {

                isMatched = false;

                break;;

            }           

        }   

        Console.WriteLine(isMatched);

    }

}