import sys
for line in sys.stdin:
	open_symbol = '({['
	close_symbol = ')}]'
	sequence_symbol=[]
	#state is tracker used to print answer once only
	state=0
	for symbol in line:
		if symbol in open_symbol:
			sequence_symbol.append(symbol)

		elif symbol in close_symbol:
			if len(sequence_symbol) > 0:
				#get index of last element in sequence_symbol list
				#so that you can map with its opposite symbol
				index=open_symbol.index(sequence_symbol[len(sequence_symbol)-1])

				#check closing symbol with last element of sequence_symbol
				if symbol == close_symbol[index]:
					sequence_symbol.pop()

				else:
					print('Unbalanced')
					state=1
					break
			else:
				print('Unbalanced')
				state=1
				break
		

	if len(sequence_symbol) is 0 and state is 0:
		print('Balanced')
	elif len(sequence_symbol) is not 0 and state is 0:
		print('Unbalanced')