#include <bits/stdc++.h>
#include "combo.h"
using namespace std;
string guess_sequence (int n) {
string p;
char other1, other2, other3;
if (press("AB")) {
if (press("A")) {
p += 'A';
other1 = 'B'; other2 = 'X'; other3 = 'Y';
}
else {
p += 'B';
other1 = 'A'; other2 = 'X'; other3 = 'Y';
}
}
else {
if (press("X")) {
p += 'X';
other1 = 'B'; other2 = 'A'; other3 = 'Y';
}
else {
p += 'Y';
other1 = 'B'; other2 = 'X'; other3 = 'A';
}
}
for (int i = 1; i <= n - 2; i++) {
string query = p + other1 + p + other2 + other1 + p + other2 + other2 + p + other2 + other3;
int x = press(query);
if (x == i) p += other3;
if (x == i + 1) p += other1;
if (x == i + 2) p += other2;
}
if (press(p + other1) == n)
return p + other1;
if (press(p + other2) == n)
return p + other2;
return p + other3;
}
