package com.scalefocus;

import java.math.BigDecimal;
import java.text.DecimalFormat;
import java.util.*;
import java.util.stream.Collectors;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = Integer.parseInt(sc.nextLine());
        boolean isBalanced = true;
        boolean openingBracket = false;
        boolean closingBracket = false;
        String input = "";
        for (int i = 0; i < n ; i++) {
            input = sc.nextLine();
            if (input.equals("(") ) {
                if (!openingBracket) {
                    openingBracket = true;
                } else {
                    isBalanced = false;
                    break;
                }

            } else if (input.equals(")") ){
                if (openingBracket) {
                    openingBracket = false;
                } else {
                    isBalanced = false;
                    break;
                }

            }

        }
        if (isBalanced && !openingBracket) {
            System.out.println("BALANCED");
        } else {
            System.out.println("UNBALANCED");
        }

    }
}