// Problem URL: https://oj.uz/problem/view/IOI18_combo
// Start Time: 5/22/2025, 1:37:39 PM
#include <bits/stdc++.h>
#include "combo.h"
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
#define mp make_pair
#define pb push_back
#define F first
#define S second
#define debug(x) std::cout << #x << ": " << x << "\n"
#define all(v) v.begin(), v.end()
#define li(i,a,b) for (int i = a; i < b; i++)
#define endl '\n'
#define mem(name,val) memset(name,val,sizeof(name))
#define min(a,b) (a<=b ? a : b)
#define max(a,b) (a>=b ? a : b)
string guess_sequence(int n){
string pref = "X";
// guess first letter
int res = press("XY");
switch (res)
{
case 1:
res = press("XA");
if(!res) pref = "Y";
break;
case 0:
pref="A";
res = press("AX");
if(!res) pref = "B";
break;
default:
break;
}
li(i,1,n-1){
stringstream q;
q << pref << "A" << pref << "YY" << pref <<"YA"<<pref<<"YB";
res = press(q.str());
if(res==i+1){
pref.append("B");
}
else if(res == i+2){
pref.append("A");
}
else{
pref.append("Y");
}
}
stringstream q;
q << pref <<"Y"<<pref<<"A";
res = press(q.str());
if(res==n-1){
pref.append("B");
}
else{
q.clear();
q << pref <<"Y";
res = press(q.str());
if(res == n){
pref.append("Y");
}
else{
pref.append("A");
}
}
return pref;
}
