n = int(input())

arr = [[0,0], [0,0]]

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

ans = 0
for i in range(2):
    for j in range(2):
        ans += arr[i][j]//2

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