using System.Numerics;

namespace _11.Snowballs
{
    internal class Program
    {
        static void Main(string[] args)
        {
            int lines = int.Parse(Console.ReadLine());
            bool openedBraket = false;
            bool isThereAProblamaticBraket = false;

            int openedBrakets = default;
            for (int i = 0; i < lines; i++)
            {
                string input = Console.ReadLine();
                for (int j = 0; j < input.Length; j++)
                {
                    if (input[j] == '(' && !openedBraket)
                    {
                        openedBraket = true;
                        openedBrakets++;
                    }
                    else if (input[j] == '(' && openedBraket)
                    {
                        isThereAProblamaticBraket = true;
                    }
                    if (input[j] == ')')
                    {
                        openedBraket = false;
                        openedBrakets--;
                    }
                }
            }
            if(openedBrakets % 2 == 0 && openedBrakets >= 0 && !isThereAProblamaticBraket)
                Console.WriteLine("BALANCED");
            else
                Console.WriteLine("UNBALANCED");
        }
    }
}