#include "combo.h"
#include <bits/stdc++.h>
using namespace std;
string guess_sequence (int N) {
string s, t;
if (press("AB")) {
if (press("A")) s = "A";
else s = "B";
} else {
if (press("X")) s = "X";
else s = "Y";
}
if (N == 1) return s;
if (s == "A") {
t[0] = 'B', t[1] = 'X', t[2] = 'Y';
}
if (s == "B") {
t[0] = 'A', t[1] = 'X', t[2] = 'Y';
}
if (s == "X") {
t[0] = 'A', t[1] = 'B', t[2] = 'Y';
}
if (s == "Y") {
t[0] = 'A', t[1] = 'B', t[2] = 'X';
}
for (int i = 1; i <= N - 2; i++) {
string tmp = s + t[0] + t[0] + s + t[0] + t[1] + s + t[0] + t[2] + s + t[1];
int cost = press(tmp);
if (cost == i) s += t[2];
else if (cost == i + 1) s += t[1];
else s += t[0];
}
if (press(s + t[0]) == N) s += t[0];
else if (press(s + t[1]) == N) s += t[1];
else s += t[2];
return s;
}
