#include "combo.h"
#include <string>
#include <vector>
using namespace std;
string guess_sequence(int N) {
string s = "";
string alphabet = "ABXY";
for (char c : alphabet) {
if (press(string(1, c)) == 1) {
s += c;
break;
}
}
vector<char> rem;
for (char c : alphabet) {
if (c != s[0]) rem.push_back(c);
}
for (int i = 1; i < N; ++i) {
char u = rem[0], v = rem[1], w = rem[2];
string test = s + u + s + v + s + w;
int res = press(test);
if (res == s.size() + 1) {
s += u;
} else if (res == 2 * s.size() + 1) {
s += v;
} else {
s += w;
}
}
return s;
}
