#include <iostream>
using namespace std;
int main(){
	int n;cin>>n;int x;cin>>x;
	int nw = -1;
	for(int i = 0; n-1 > i; i++){
		cin>>x;
		if(x != 1)nw = i+1;
	}
	if(nw != -1){
		cout << ((n-nw)%2 ? "Alice" : "Bob") << endl;
	}else{
		cout << (n%2 ? "Alice" : "Bob") << endl;
	}
}