#include <bits/stdc++.h>
using namespace std;
int main(){
  int N;
  cin >> N;
  vector<int> A(N);
  for (int i = 0; i < N; i++){
    cin >> A[i];
  }
  int X = 0;
  for (int i = 1; i < N; i += 2){
    X ^= A[i];
  }
  if (X != 0){
    cout << "Alice" << endl;
  } else {
    cout << "Bob" << endl;
  }
}