N = int(input())
xys = [list(map(int, input().split())) for n in range(N)]
deleted = []
used = []
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:
            middle = [(p1[0] + p2[0])//2, (p1[1] + p2[1])//2]
            if not(middle in deleted) and not(p2 in used ) and not(p1 in used):
                deleted.append(middle)
                used.append(p1)
                used.append(p2)
if len(deleted) % 2 == 0:
    print("Bob")
else:
    print("Alice")