#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i = 0; i < (int)n; i++)
using ll = long long;

int main(){
  int n;
  cin >> n;
  vector<int> a(n);
  rep(i,n) cin >> a[i];
  int cur = 0;
  for(int i = 1; i < n; i += 2) cur ^= a[i];
  cout << (cur ? "Alice" : "Bob") << endl;
  return 0;
}