#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define rep(i, n) for (int i = 0; i < (n); i++)
#define P pair<int, int>

int main() {
  int n;
  cin >> n;
  vector<int> a(n);
  rep(i,n) cin >> a[i];
  int flag = 1;
  for (int i = 1; i < n; i++) {
    if (a[i] == 1) { 
      flag *= -1;
    } else {
      if (flag == -1) flag *= -1;
    }
  }
  if (flag == 1) cout << "Alice" << endl;
  else cout << "Bob" << endl;


}