using System;

public class Program

{

    public static void Main()

    {

    string s1 = "khuong";

string s2 = "gnouhk";

int n = s1.Length-1;

for (int i = 0; i < s1.Length; i++)

{

    if (s1[i] != s2[n--])

    {

        Console.Write("not");

    }

}

    }

}