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

int main() {
  int n;
  cin >> n;
  vector<int> a(n);
  rep(i, n) cin >> a[i];
  int turn = 1;
  rep(i, n - 1) if (i == 0 || a[i] == 1) turn = 1 - turn;
  if (a[n - 1] > 1 && turn == 1) turn = 0;
  else if (a[n - 1] == 1) turn = 1 - turn;
  if (turn == 0) cout << "Alice" << endl;
  else cout << "Bob" << endl;
  return 0;
}