N=int(input())
l=[]
for i in range(N):
	x,y=map(int,input().split())
	if(x%2==0 and y%2==0):
		l.append(1)
	elif(x%2==1 and y%2==0):
		l.append(2)
	elif(x%2==0 and y%2==1):
		l.append(3)
	elif(x%2==1 and y%2==1):
		l.append(4)
	else:
		l.append(5)
if (l.count(1)//2+l.count(2)//2+l.count(3)//2+l.count(4)//2)%2==0:
	print("Bob")
else:
	print("Alice")