#include <iostream> #include <algorithm> #include <iomanip> #include <vector> #include <queue> #include <set> #include <map> #include <tuple> #include <cmath> #include <numeric> #include <functional> #include <cassert> #define debug_value(x) cerr << "line" << __LINE__ << ":<" << __func__ << ">:" << #x << "=" << x << endl; #define debug(x) cerr << "line" << __LINE__ << ":<" << __func__ << ">:" << x << endl; template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; } template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; } using namespace std; typedef long long ll; int main(){ ios::sync_with_stdio(false); cin.tie(0); cout << setprecision(10) << fixed; int n; cin >> n; vector<int> a(n); for(int i = 0; i < n; i++) cin >> a[i]; vector<bool> win(n); win[0] = true; for(int i = 1; i < n; i++){ if(win[i-1]){ if(a[i] == 1) win[i] = false; else win[i] = true; }else{ win[i] = true; } } if(win[n-1]){ cout << "Alice" << endl; }else{ cout << "Bob" << endl; } }