#include <bits/stdc++.h>
#include "combo.h"
// #include "grader.cpp"
using namespace std;
#define all(x) x.begin(), x.end()
string guess_sequence(int n) {
int pf = 0;
string p;
vector<char> F {'A', 'B', 'X'};
for(auto c : F) {
if(press(p + c) == pf + 1) {
pf++;
p += c;
F.erase(find(all(F), c));
break;
}
}
if(!pf) {
p += 'Y';
pf++;
} else {
F.push_back('Y');
}
vector<char> S {F[0], F[1]};
for(int i = 1; i < n; i++) {
int _pf = pf;
for(auto c : S) {
if(press(p + c) == pf + 1) {
p += c;
pf++;
break;
}
}
if(_pf == pf) {
p += F[2];
pf++;
}
}
return p;
}
