#include "combo.h"
#include <bits/stdc++.h>
using namespace std;
string guess_sequence(int n) {
string s = "";
int c1 = press("AB");
int c2;
if (c1 > 0) {
c2 = press("A");
if (c2 > 0) {
s = "A";
} else {
s = "B";
}
} else {
c2 = press("X");
if (c2 > 0) {
s = "X";
} else {
s = "Y";
}
}
string p = s;
string t = "ABXY";
t.erase(t.find(p[0]));
for (int i = 1; i <= n; i++) {
string cur = s + t[0] + t[0] + s + t[0] + t[1] + s + t[0] + t[2] + s + t[1] + p;
int c = press(cur);
if (c == 0) {
s += t[0];
} else if (c == 1) {
s += t[1];
} else {
s += t[2];
}
}
return s;
}
