n = int(input())

list = []

kisu = 0
gusu = 0
kigu = 0
guki = 0

for i in range(n):
	x, y = (int(j) for j in input().split())
	if x % 2 != 0:
		if y % 2 != 0:
			kisu += 1
		else:
			kigu += 1	
	else:
		if y % 2 != 0:
			guki += 1
		else:
			gusu += 1

sum = int(kisu / 2) + int(kigu / 2) + int(guki / 2) + int(gusu / 2)

if sum % 2 != 0:
	print("Alice")
else:
	print("Bob")