import sys
from collections import defaultdict
readline = sys.stdin.readline
N = int(readline())
g = [0] * 4
for _ in [0] * N:
    x, y = map(int, readline().split())
    g[(x & 1) << 1 ^ (y & 1)] += 1
print("Alice" if sum(i // 2 for i in g) & 1 else "Bob")