#include <bits/stdc++.h>
#include "combo.h"
using namespace std;
#define all(x) (x).begin(), (x).end()
typedef long long ll;
typedef unsigned long long int ull;
const ll md = 1e9+7;
const int ukr = 2e5+10;
vector<int> v;
string s;
string guess_sequence(int N) {
string ans = "";
int val = press("AB");
if(val >= 1){
if(val == 1){
ans += "A";
}else{
ans += "B";
}
}else{
val = press("X");
if(val >= 1){
ans += "X";
}else{
ans += "Y";
}
}
N--;
if(!N){
return ans;
}
if(ans == "A"){
int old = ans.length();
while(N-1){
val = press(ans+"BB"+ans+"BX"+ans+"BY"+ans+"X");
if((val-old) == 2){
ans += "B";
}else if((val-old)){
ans += "X";
}else{
ans += "Y";
}
old++;
N--;
}
val = press(ans+"B");
if(val == old+1){
ans += "B";
}else{
val = press(ans+"X");
if(val == old+1){
ans += "X";
}else{
ans += "Y";
}
}
}else if(ans == "B"){
int old = ans.length();
while(N-1){
val = press(ans+"AA"+ans+"AX"+ans+"AY"+ans+"X");
if((val-old) == 2){
ans += "A";
}else if((val-old)){
ans += "X";
}else{
ans += "Y";
}
old++;N--;
}
val = press(ans+"A");
if(val == old+1){
ans += "A";
}else{
val = press(ans+"X");
if(val == old+1){
ans += "X";
}else{
ans += "Y";
}
}
}else if(ans == "X"){
int old = ans.length();
while(N-1){
val = press(ans+"AA"+ans+"AB"+ans+"AY"+ans+"B");
if((val-old) == 2){
ans += "A";
}else if((val-old)){
ans += "B";
}else{
ans += "Y";
}
old++;N--;
}
val = press(ans+"B");
if(val == old+1){
ans += "B";
}else{
val = press(ans+"A");
if(val == old+1){
ans += "A";
}else{
ans += "Y";
}
}
}else{
int old = ans.length();
while(N-1){
val = press(ans+"AA"+ans+"AB"+ans+"AX"+ans+"B");
if((val-old) == 2){
ans += "A";
}else if((val-old)){
ans += "B";
}else{
ans += "X";
}
old++;N--;
}
val = press(ans+"B");
if(val == old+1){
ans += "B";
}else{
val = press(ans+"X");
if(val == old+1){
ans += "X";
}else{
ans += "A";
}
}
}
return ans;
}
/* int main() {
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
int t =1;
//cin >> t;
for(int i = 1; i <= t; i++){
//cout << "Case " << i << ": ";
solve();
}
} */
