def main():
    N = int(input())
    XY = tuple(tuple(map(int, input().split())) for _ in [0] * N)

    cnt = [0] * 4
    for x, y in XY:
        if x & 1:
            if y & 1:
                cnt[0] += 1
            else:
                cnt[1] += 1
        else:
            if y & 1:
                cnt[2] += 1
            else:
                cnt[3] += 1

    n = 0
    for i in cnt:
        n += i // 2

    if n & 1:
        print('Alice')
    else:
        print('Bob')

main()