N = int(input())
types = [[0] * (2) for _ in range(2)]
for i in range(N):
    x, y = map(int, input().split())
    x %= 2
    y %= 2
    types[x][y] += 1

cnt = 0
for i in range(2):
    for j in range(2):
        cnt += types[i][j]//2

if cnt%2 == 0:
    print('Bob')
else:
    print('Alice')