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