06. Balanced Brackets

import java.util.Scanner;

class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n = Integer.parseInt(scanner.nextLine()),
            openBrackets = 0;
        String bracket = "";

        for (int i = 0; i < n; i++) {
            bracket = scanner.nextLine();
            if (bracket.equals(")")) {
                openBrackets--;
                if (openBrackets < 0) {
                    break;
                }
            } else if (bracket.equals("(")) {
                openBrackets++;
                if (openBrackets > 1) {
                    break;
                }
            }
        }

        if (openBrackets == 0) {
            System.out.println("BALANCED");
        } else {
            System.out.println("UNBALANCED");
        }
    }
}