import sys
input=lambda: sys.stdin.readline().rstrip()

n=int(input())
A=[0]*4
for _ in range(n):
  x,y=map(int,input().split())
  if x%2==0:
    if y%2==0:
      A[0]+=1
    else:
      A[1]+=1
  else:
    if y%2==0:
      A[2]+=1
    else:
      A[3]+=1
ans=0
for a in A:
  ans+=a//2
if ans%2==1:
  print("Alice")
else:
  print("Bob")