BalancedBrackets

using System;

namespace _06BalancedBrackets
{
    class Program
    {
        static void Main(string[] args)
        {
            var n = int.Parse(Console.ReadLine());

            int openingBracket = 0;
            int consecutiveOpeningBrackets = 0;
            for (int i = 1; i <= n; i++)
            {
                string text = Console.ReadLine();

                if (text == ")")
                {
                    openingBracket--;
                    if (openingBracket == -1)
                    {
                        consecutiveOpeningBrackets++;
                        break;
                    }
                }
                else if (text == "(")
                {
                    openingBracket++;
                    if (openingBracket == 2)
                    {
                        consecutiveOpeningBrackets++;
                        break;
                    }
                }
            }
            if (openingBracket == 0 && consecutiveOpeningBrackets == 0)
            {
                Console.WriteLine("BALANCED");
            }
            else
            {
                Console.WriteLine("UNBALANCED");
            }
        }
    }
}