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

int main() {
    int N;
    cin >> N;
    vector<int> A(N);
    for (auto&& a : A) {
        cin >> a;
    }
    bool maine = true;
    int cnt = 0;
    for (int i = A.size() - 1; i >= 0; i--) {
        if (A[i] == 1) {
            maine ^= 1;
            cnt++;
        } else
            break;
    }
    if (cnt == A.size())
        maine ^= 1;
    cout << (maine ? "Alice" : "Bob") << endl;
}