#include "combo.h"
#include <bits/stdc++.h>
using namespace std;
string guess_sequence(int N){
vector<string> b = {"A", "B", "X", "Y"};
string p, S = "";
int first;
if (press("XY") >= 1){
if (press("X") == 1) first = 2;
else first = 3;
}
else {
if (press("A") == 1) first = 0;
else first = 1;
}
S += b[first];
if (N == 1) return S;
b.erase(b.begin() + first);
for (int i = 1; i < N-1; i++){
p = (S + b[1]) + (S + b[2] + b[0]) + (S + b[2] + b[1]) + (S + b[2] + b[2]);
S += b[press(p) - S.length()];
}
if (press(S + b[0]) == N) S += b[0];
else if (press(S + b[1]) == N) S += b[1];
else S += b[2];
return S;
}
