#include <bits/stdc++.h>
using namespace std;
#define pb push_back
//string answer = "YBXXAB";
int press(string s); /*{
int mx = 0;
for(int i = 0;i < s.size();i++) {
if(s[i] == answer[0]) {
int res = 1;
for(int j = i+1;j < s.size();j++) {
if(s[j] != answer[j-i]) break;
res++;
}
mx = max(mx, res);
}
}
return mx;
}*/
string guess_sequence(int n) {
vector<string> v = {"A", "B", "X", "Y"};
string s;
if(press("AB")) {
if(press("A")) {
s = "A";
swap(v[0], v[3]);
}
else {
s = "B";
swap(v[1], v[3]);
}
}
else {
if(press("X")) {
s = "X";
swap(v[2], v[3]);
}
else {
s = "Y";
}
}
v.pop_back();
for(auto &p : v) cout << p << " ";
cout << "\n";
for(int i = 2;i <= n;i++) {
string test = s + v[0] + s + v[1];
if(press(test) == i) {
if(press(s+v[0]) == i) {
s += v[0];
continue;
}
s += v[1];
continue;
}
s += v[2];
}
return s;
}
/*int main() {
cout << guess_sequence(answer.size());
}*/
