N = int(input())

XY = [0] * 4

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