#include "combo.h"
#include <bits/stdc++.h>
using namespace std;
typedef int64_t ll;
typedef string str;
#define pb push_back
#define pf push_front
#define ppb pop_back
#define ppf pop_front
#define F first
#define S second
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define sz(x) (int)x.size()
string guess_sequence(int N) {
str res;
vector <char> v;
if (!press("X")) v.pb('X');
else res += 'X';
if (!press("Y")) v.pb('Y');
else res += 'Y';
if (!press("A")) v.pb('A');
else res += 'A';
if (!press("B")) v.pb('B');
else res += 'B';
for (int i = 2; i <= N; i++) {
for (char ask : v) {
if (press(res + ask) == i) {
res += ask;
break;
}
}
}
return res;
}
