package com.company;

import java.util.Scanner;

public class BalancedBrackets {

    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);

        int n = Integer.parseInt(scanner.nextLine());

        int count=0;
        int count1=0;
        for (int i = 0; i < n; i++) {
            String wordone = scanner.nextLine();
            for (int j = 0; j < wordone.length(); j++) {
                char c = wordone.charAt(j);
                if (c=='('){
                    count++;
                }
                if (c==')'){
                    count1++;
                }
            }
        }
       if (count==count1){
           System.out.println("BALANCED");
       }else {
           System.out.println("UNBALANCED");
       }
    }
}