#include "combo.h"
#include <bits/stdc++.h>
using namespace std;
#define all(x) x.begin(), x.end()
// int press(string hm) {
// cout << hm << endl;
// int ans;cin>>ans;
// return ans;
// }
string S = "ABXY";
char getpatokan() {
char x = 'O';
for (int j = 0; j < 3; j++) {
string r;
r += S[j];
if (press(r) == 1) {
x = S[j];
break;
}
}
return (x == 'O' ? S[3] : x);
}
// ABXYBYYXB
// patokan: A
// BXYBYYXB
// guess 2 chars by 2 queries
// XX, BX, BY, YB -> 2
// XB, BB, XY, YX -> 1
// XXX
// AYY
string guess_sequence(int n) {
if (n == 0) return "";
char patokan = getpatokan();
set<char> st{'A', 'B', 'X', 'Y'};
st.erase(patokan);
string now;
now += patokan;
vector<char> a(all(st));
// cout << a << endl;
for (int i = 0; i < n-1; i++) {
// cout << now << endl;
string s;
for (int j = 0; j < 3; j++) s += now + a[0] + a[j];
s += now + a[1];
int x = press(s);
if (x-now.size() == 0) now += a[2];
else if (x - now.size() == 1) now += a[1];
else now += a[0];
}
return now;
}
// int main() {
// int n;cin>>n;
// cout << guess_sequence(n) << endl;
// }
