#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 = 0;
  for (int i = n - 1; i >= 0; i--) {
    if (a[i] == 1) turn = !turn;
    else break;
  }
  printf("%s\n", turn == 0 ? "Alice" : "Bob");
  return 0;
}