using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("apakah palindrome?\n");

        Console.WriteLine(palindrome("kasUr ru Sa K"));

    }

// if u want to return true/false, change the first string to bool

    public static string palindrome(string s)

    {

        s = s.ToLower().Replace(" ", "");

        if (s.Length <= 1)

        {

            //return true;

            return "yoi";

        }

        else if (s[0] != s[s.Length - 1])

        {

            //return false;

            return "bukan";

        }

        else

        {

            return palindrome(s.Substring(1, s.Length - 2));

        }

    }

}