brackets

n_lines = int(input())
open_brack = None
closed_brack = None
is_balanced = None

counter = 0
for each_line in range(n_lines):
    command = input()
    if command != '(' and command != ')':
        pass
    else:
        if command == '(':
            counter += 1
            if open_brack is None:
                open_brack = command
            else:
                closed_brack = command

        elif command == ')':
            counter += 1
            if open_brack is None:
                open_brack = command
            else:
                closed_brack = command

        if counter == 2:
            if open_brack == '(' and closed_brack == ')':
                is_balanced = True
            else:
                is_balanced = False
            open_brack = None
            closed_brack = None
            counter = 0

if is_balanced:
    print('BALANCED')
else:
    print('UNBALANCED')