#include "combo.h"
#include<bits/stdc++.h>
#define ll long long
#define F first
#define S second
using namespace std;
char ori[4]={'A','B','X','Y'};
int Pint(vector<int> v){
string s="";
for(auto x:v){
s+=ori[x];
}
return press(s);
}
string guess_sequence(int N) {
int l=0,r=3;
while(l!=r){
int m=(l+r)>>1;
vector<int> v;
for(int i=l;i<=m;i++){
v.push_back(i);
}
if(Pint(v)){
r=m;
}else{
l=m+1;
}
}
string now="";
now+=ori[l];
for(int i=2;i<N;i++){
int ct=press(now+ori[(l+1)%4]+now+ori[(l+2)%4]+ori[(l+1)%4]+now+ori[(l+2)%4]+ori[(l+2)%4]+now+ori[(l+2)%4]+ori[(l+3)%4]);
if(ct==i){
now+=ori[(l+1)%4];
}else if(ct==i+1){
now+=ori[(l+2)%4];
}else {
now+=ori[(l+3)%4];
}
}
for(int i=1;i<3;i++){
if(press(now+ori[(l+i)%4])==N){
now+=ori[(l+i)%4];
break;
}
}
if(now.length()<N){
now+=ori[(l+3)%4];
}
return now;
}
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