#include "combo.h"
#include<bits/stdc++.h>
#define all(x) x.begin(), x.end()
#define pq priority_queue
#define lb lower_bound
#define ub upper_bound
#define pb push_back
#define eb emplace_back
#define F first
#define S second
using namespace std;
string guess_sequence(int N) {
string S;
string o;
if (press("AB")) {
if (press("A")) {S = "A"; o = "BXY";}
else {S = "B"; o = "AXY";}
}
else {
if (press("X")) {S = "X"; o = "ABY";}
else {S = "Y"; o = "ABX";}
}
for (int i = 1; i < N-1; i++) {
string tmp = S + o[0] + o[0] + S + o[0] + o[1] + S + o[0] + o[2] + S + o[1];
int ct = press(tmp);
if (ct == i+2) S += o[0];
else if (ct == i+1) S += o[1];
else S += o[2];
}
if (press(S + o[0]) == N) S += o[0];
else if (press(S + o[1]) == N) S += o[1];
else S += o[2];
return S;
}
