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

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