n = int(input())
from collections import defaultdict

groups = defaultdict(int)
for _ in range(n):
    x, y = map(int, input().split())
    key = (x % 2, y % 2)
    groups[key] += 1

total = 0
for count in groups.values():
    total += count // 2

print("Alice" if total % 2 == 1 else "Bob")