using System;

using System.Collections;

using System.Collections.Generic;               

public class Program

{

    public static void Main()

    {

        Stack <char>a=new Stack<char>();

        Stack <char>b=new Stack<char>();

        Console.WriteLine(" Enter the word");

        string word=Console.ReadLine();

        foreach(char s in word){

            a.Push(s);}

        int z=a.Count;

        foreach(char q in a){

            b.Push(q);}

        for(int i=0;i<z;i++){

            char e=a.Pop();

            char r=b.Pop();

            if(e!=r ){ i=z;

                Console.WriteLine(" isnot ");}

            /*else if (i==z && r==e ){

                Console.WriteLine("is");}*/

        else Console.WriteLine("is");}

        /*if(a.Equals(b)){

            Console.WriteLine(" The stack is palindrome");}

            else Console.WriteLine(" The stack isnot palindrome");

        foreach(char f in a){

            Console.Write(f);}

        Console.WriteLine(" " );

        foreach(char m in b){

            Console.Write(m);}

        /*for(int i=0;i<z;i++){

            char e=a.Pop();

            char r=b.Pop();

            if(e!=r ){ i=z;

                Console.WriteLine(" isnot ");}

            else if (r==e && i==z){

                Console.WriteLine("is");}}

        /*if(a==b){

            Console.WriteLine(" The stack is palindrome");}

            else Console.WriteLine(" The stack isnot palindrome");

        /*foreach(char f in a){

            Console.Write(f);}

        Console.WriteLine(" " );

        foreach(char m in b){

            Console.Write(m);}*/

    }

}