#include <iostream>
#include <vector>

using namespace std;

void solve() {
    int n;
    cin >> n;

    vector<int> xs(n);
    for (auto& x : xs) cin >> x;

    bool alice = true;
    while (!xs.empty() && xs.back() == 1) {
        alice = !alice;
        xs.pop_back();
    }

    if (xs.empty()) alice = !alice;

    cout << (alice ? "Alice" : "Bob") << "\n";
}

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    solve();

    return 0;
}