#include <iostream>
#include <vector>
using namespace std;

int main(){
    int n;
    cin >> n;
    vector<int> a(n);
    for(auto &p: a) cin >> p;

    vector<bool> memo(n, false);
    memo[0] = true;
    for(int i = 1; i < n; i++){
        if(a[i] == 1){
            memo[i] = !memo[i-1];
        }else{
            memo[i] = true;
        }
    }

    if(memo[n-1]) cout << "Alice" << endl;
    else cout << "Bob" << endl;
    return 0;
}