BalancedBrackets

using System;
using System.Collections.Generic;

namespace balancedBreckets
{
    class MainClass
    {
        public static void Main(string[] args)
        {
            int numberOfLines = int.Parse(Console.ReadLine());
            List < string > listOfOpenedBrackets= new List<string>();
            List<string> listOfClosedBrackets= new List<string>();

            for (int i = 0; i < numberOfLines; i++)
            {
                string input = Console.ReadLine();
                if (input == ")"&& listOfOpenedBrackets.Count==0)
                {
                    Console.WriteLine("UNBALANCED");
                    return;
                }

               else if (input == "(")
                {

                    listOfOpenedBrackets.Add(input);
                    if (listOfOpenedBrackets.Count == 2)
                    {
                        Console.WriteLine("UNBALANCED");
                        return;
                    }
                }

                else if (input == ")")
                {
                    listOfClosedBrackets.Add(input);
                    if (listOfClosedBrackets.Count == 2)
                    {
                        Console.WriteLine("UNBALANCED");
                        return;
                    }
                }

                if (listOfOpenedBrackets.Count==1 && listOfClosedBrackets.Count==1)
                {
                    listOfOpenedBrackets.Clear();
                    listOfClosedBrackets.Clear();
                }
            }

            if (listOfOpenedBrackets.Count==listOfClosedBrackets.Count)
            {
                Console.WriteLine("BALANCED");
            }
            else
            {
                Console.WriteLine("UNBALANCED");
            }

        }
    }
}