#include "combo.h"
#include <bits/stdc++.h>
using namespace std;
string guess_sequence(int N) {
vector<char> ch = {'A', 'B', 'X', 'Y'};
int x = press("AB");
string s = "";
if (x) {
if (press("A")) {
s += 'A';
ch.erase(ch.begin());
} else {
s += 'B';
ch.erase(ch.begin() + 1);
}
} else {
if (press("X")) {
s += 'X';
ch.erase(ch.begin() + 2);
} else {
s += 'Y';
ch.erase(ch.begin() + 3);
}
}
for (int i = 1; i < N - 1; ++i) {
x = press(s + ch[0] + ch[0] + s + ch[0] + ch[1] + s + ch[0] + ch[2] + s + ch[1]);
if (x == i + 2) s += ch[0];
else if (x == i + 1) s += ch[1];
else s += ch[2];
}
if (press(s + ch[0] + s + ch[1]) == N) {
if (press(s + ch[0]) == N) s += ch[0];
else s += ch[1];
} else {
s += ch[2];
}
return s;
}
