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