n=int(input())
even=0#偶数
odd=0#奇数
mix=0
mis=0
for i in range(n):
    x,y=map(int,input().split())
    if x%2==0 and y%2==0:
        even+=1
    if x%2!=0 and y%2!=0:
        odd+=1
    if x%2!=0 and y%2==0:
        mix+=1
    if x%2==0 and y%2!=0:
        mis+=1
if (even/2+odd//2+mis//2+mix//2)%2==0:
    print("Bob")
else:
    print("Alice")