N = int(input())
L = [0] * 4
for i in range(N):
    x, y = map(int, input().split())
    L[x % 2 * 2 + y % 2] += 1
ans = 0
for a in L:
    ans += a // 2
if ans % 2:
    print("Alice")
else:
    print("Bob")