#include <iostream>
using namespace std;

int main()
{
    int n;
    cin >> n;
    int a[200005];
    for (int i = 0; i < n; i++)
    {
        cin >> a[i];
    }
    int x = 0;
    for (int i = 1; i < n; i += 2)
    {
        x ^= a[i];
    }
    cout << (x ? "Alice" : "Bob") << endl;
}