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!=0 and y%2!=0:
        l.append(2)
    elif x%2==0 and y%2!=0:
        l.append(3)
    elif x%2!=0 and y%2==0:
        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")