N = int(input())
L = [[0] * 2 for i in range(2)]
for i in range(N):
    x,y = map(int,input().split())
    L[x%2][y%2]+=1
if (L[0][0]//2+L[0][1]//2+L[1][0]//2+L[1][1]//2)%2==1:
    print('Alice')
else:
    print('Bob')