Balanced Brackets

number_of_lines = int(input())
open_bracket = 0
close_bracket = 0

for _ in range(number_of_lines):
    string = input()
    if string == "(":
        open_bracket += 1
        if open_bracket == 2 and close_bracket == 0:
            print('UNBALANCED')
            exit()
    elif string == ")":
        close_bracket += 1

if close_bracket > open_bracket or open_bracket > close_bracket:
    print('UNBALANCED')
else:
    print('BALANCED')