#include "combo.h"
#include <bits/stdc++.h>
using namespace std;
string guess_sequence(int N) {
string BUTTONS = "ABXY";
int first_button = press("AB") ? (press("A") ? 0 : 1) : (press("X") ? 2 : 3);
swap(BUTTONS[3], BUTTONS[first_button]);
string res(1, BUTTONS[3]);
for(int i = 2; i < N; ++i) {
string ask = res;
ask.push_back(BUTTONS[0]);
for(int j = 0; j < 3; ++j) {
for(char ch : res) {
ask.push_back(ch);
}
ask.push_back(BUTTONS[1]);
ask.push_back(BUTTONS[j]);
}
int o = press(ask);
if(o == i) {
res.push_back(BUTTONS[0]);
}
else if(o == i + 1) {
res.push_back(BUTTONS[1]);
}
else {
res.push_back(BUTTONS[2]);
}
}
if(N > 1) {
int last = 0;
for(int ch = 1; ch < 3; ++ch) {
string ask = res;
ask.push_back(BUTTONS[ch]);
if(press(ask) == N) {
last = ch;
break;
}
}
res.push_back(BUTTONS[last]);
}
cout << res << '\n';
return res;
}
