#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
#define rep(i,a) for(int i=0;i<(a);i++)
#define MOD 1000000007

int cnt[4];

int main(){
  int N;cin>>N;
  rep(i,N){
    int x,y;
    cin>>x>>y;
    x%=2,y%=2;
    cnt[y*2+x]++;
  }
  int sum=0;
  rep(i,4){
    sum+=cnt[i]/2;
  }
  if(sum%2) cout<<"Alice"<<endl;
  else cout<<"Bob"<<endl;
  return 0;
}