import sys

def solve():
    n = int(sys.stdin.readline())

    assert 2 <= n <= 10**6

    cnt = [0] * 4
    # xy = set()

    for i in range(n):
        x, y = map(int, sys.stdin.readline().split())
        cnt[((x & 1) << 1) ^ (y & 1)] += 1

        # assert (x, y) not in xy
        # xy.add((x, y))

    turn = 0

    for i in range(4):
        turn += (cnt[i] // 2)

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


if __name__ == '__main__':
    solve()