#include <iostream>
using namespace std;

int main()
{
    int n;
    cin >> n;
    int a[200005];
    for(int i = 0; i < n; i++) cin >> a[i];
    bool first = true;
    int i;
    for(i = n - 1; i >= 0; i--){
        if(a[i] != 1) break;
        first = !first;
    }
    if(i == -1){
        if(n % 2) cout << "Alice" << endl;
        else cout << "Bob" << endl;
    }
    else{
        if(first) cout << "Alice" << endl;
        else cout << "Bob" << endl;
    }
}