#include<bits/stdc++.h>
#include "combo.h"
using namespace std;
string guess_sequence(int N) {
string c = "ABXY";
if (press("AB") >= 1) {
if (press("A") == 1) {
} else {
swap(c[0], c[1]);
}
} else {
if (press("X") == 1) {
swap(c[0], c[2]);
} else {
swap(c[0], c[3]);
}
}
string S = "";
S += c[0];
for (int i = 2; i < N; i++) {
string str = S + c[1] + c[1] + S + c[1] + c[2] + S + c[1] + c[3] + S + c[2];
int sz = (int)S.size();
int taken = press(str);
//cerr << str << ' ' << taken << '\n';
if (taken - sz == 2)
S += c[1];
else if (taken - sz == 1)
S += c[2];
else S += c[3];
}
bool ok = false;
for (int i = 1; i <= 2; i++) {
string str = S + c[i];
if (press(str) == N) {
S += c[i];
ok = true;
break;
}
}
if (!ok) S += c[3];
return (S);
}
