using System;

public class Program

{

    public bool isPal(string str, int start, int end)

    {

        if(start >= end)

        {

            return false;

        }

        return (str[start] == str[end]) && isPal(str, start+1, end-1);

    }

    public static void Main()

    {

        int start = 0;

        string s = "ana";

        int n = s.Length-1;

        int end = n-1;

        Program p = new Program();

        Console.WriteLine(p.isPal(s,start,end));

    }

}