06.BalancedBrackets

using System;
using System.Text;
using System.Text.RegularExpressions;

namespace _06.BalancedBrackets3
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());

            StringBuilder text = new StringBuilder();

            Regex regex = new Regex(@"^([^(\)]*\([^(\)]*\)[^(\)]*)*$");

            for (int i = 0; i < n; i++)
            {
                string line = Console.ReadLine();
                text.Append(line);
            }

            Match match = regex.Match(text.ToString());

            if (match.Success)
            {
                Console.WriteLine("BALANCED");
            }
            else
            {
                Console.WriteLine("UNBALANCED");
            }
        }
    }
}