#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000001
vector<int> A;

bool get(int cur){
	if(cur==A.size()){
		return false;
	}
	
	if(A[cur]==1){
		if(get(cur+1))return false;
		else return true;
	}
	return true;
}

int main(){
	
	int N;
	cin>>N;
	A.resize(N);
	
	rep(i,N){
		cin>>A[i];
	}
	
	reverse(A.begin(),A.end());
	
	if(get(0)){
		cout<<"Alice"<<endl;
	}
	else{
		cout<<"Bob"<<endl;
	}
	
    return 0;
}