#include <bits/stdc++.h>

using namespace std;
using ll = long long;

int main(){

    int N;
    cin >> N;
    vector<int> A(N);
    for (int i=0; i<N; i++) cin >> A[i];
    for (int i=0; i<N; i++){
        if (A[N-1-i] != 1){
            cout << (i % 2 == 0 ? "Alice" : "Bob") << endl;
            return 0;
        }
    }

    cout << (N % 2 == 1 ? "Alice" : "Bob") << endl;

    return 0;
}