int[] a = new int[100];
            int n, isPalindrom = 1;
            n = Convert.ToInt32(Console.ReadLine());
            for(int i = 0; i < n; i++)
                a[i] = Convert.ToInt32(Console.ReadLine());
            for (int i = 0; i < n && isPalindrom == 1; i++)
                if (a[i] != a[n - i - 1])
                    isPalindrom = 0;
            if (isPalindrom == 0) Console.WriteLine("Nu");
            else Console.WriteLine("Da");