n = int(input())

xx = xy = yx = yy = 0

for i in range(n):
    x, y = map(int, input().split())
    if x % 2 == 0 and y % 2 == 0:
        xx += 1
    if x % 2 == 0 and y % 2 == 1:
        xy += 1
    if x % 2 == 1 and y % 2 == 0:
        yx += 1
    if x % 2 == 1 and y % 2 == 1:
        yy += 1

if (xx // 2 + xy // 2 + yx // 2 + yy // 2) % 2 == 1:
    print("Alice")
else:
    print("Bob")