#!/usr/bin/env python3

import collections


def can_alice_win(ps):
    ctr = collections.Counter(2 * (x % 2) + (y % 2) for x, y in ps)
    res = sum(v // 2 for v in ctr.values()) % 2
    return bool(res)


def main():
    n = int(input())
    ps = [tuple(int(z) for z in input().split()) for _ in range(n)]
    print("Alice" if can_alice_win(ps) else "Bob")


if __name__ == '__main__':
    main()