#include<bits/stdc++.h>
using namespace std;
using ll = long long int;
using ld = long double;
#define pow(n,m) powl(n,m)
#define sqrt(n) sqrtl(n)
const ll MAX = 1000000000000000000;
const ll MOD = 1000000007;
//998244353;
void randinit(){srand((unsigned)time(NULL));}
int main(){
    ll N;
    cin >> N;
    vector<ll> A(0);
    for(ll i = 0;i < N;i++){
        ll a;
        cin >> a;
        A.emplace_back(a);
        if(A.size() >= 2 && A[A.size() - 1] == 1 && A[A.size() - 2] == 1){
            A.pop_back();
            A.pop_back();
        }
    }
    if(A.size() == 0) cout << "Bob" << endl;
    else if(A.size() == 1) cout << "Alice" << endl;
    else{
        if(A[A.size() - 1] == 1) cout << "Bob" << endl;
        else cout << "Alice" << endl;
    }
}