n = int(input())

odd_even_list = [0]*4

for i in range(n):
	x, y = [int(v) for v in input().split() ]
	if x % 2 == 0:
		if y % 2 == 0:
			odd_even_list[0] += 1
		else:
			odd_even_list[1] += 1
	else:
		if y % 2 == 0:
			odd_even_list[2] += 1
		else:
			odd_even_list[3] += 1

odd_even_list = list(map(lambda x: x // 2, odd_even_list))

if sum(odd_even_list) % 2 == 1:
	print("Alice")
else:
	print("Bob")