N = int(input())
xys = [list(map(int, input().split())) for n in range(N)]
middles = [ [(p1[0] + p2[0])//2, (p1[1] + p2[1])//2]
            for i, p1 in enumerate(xys)
            for p2 in xys[i+1:]
            if (p1[0] + p2[0]) % 2 == 0 and (p1[1] + p2[1]) % 2 == 0]
if len(middles) % 2 == 0:
    print("Bob")
else:
    print("Alice")