#include <bits/stdc++.h>
#include "combo.h"
#define startt ios_base::sync_with_stdio(false);cin.tie(0);
typedef long long ll;
using namespace std;
#define vint vector<int>
#define all(v) v.begin(), v.end()
#define MOD 1000000007
#define MOD2 998244353
#define MX 1000000000
#define MXL 1000000000000000000
#define PI (ld)2*acos(0.0)
#define nax 200005
#define pb push_back
#define sc second
#define fr first
//#define int long long
#define endl '\n'
#define ld long double
#define NO cout << "NO" << endl
#define YES cout << "YES" << endl
/*
*/
string guess_sequence(int n)
{
string s;
vector<char> a;
a.pb('A');
a.pb('B');
a.pb('X');
a.pb('Y');
for(int i = 0; i < n; i++)
{
s.pb('*');
for(int j = 0; j < n; j++)
{
s[s.size()-1] = a[j];
int c = press(s);
if(c == i+1)
{
break;
}
}
}
return s;
}
