#include <bits/stdc++.h>
using namespace std;
using i64 = long long;
#define rep(i,s,e) for(int (i) = (s);(i) <= (e);(i)++)
int main(){
  int N;
  cin >> N;
  vector<int> c(4,0);
  for(int i = 0;i < N;i++){
    int x,y;
    cin >> x >> y;
    x &= 1;
    y &= 1;
    c[x | (y << 1)]++;
  }
  int sum = 0;
  for(int i = 0;i < 4;i++){
    sum += c[i];
  }
  if(sum & 1){
    cout << "Alice" << endl;
  }
  else{
    cout << "Bob" << endl;
  }
}