#include<bits/stdc++.h>
#include "combo.h"
/* Pragmaaa */
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
/* Primitive Data */
#define ll long long
#define db double
/* Pair Macro */
#define pii pair<int,int>
#define pll pair<ll,ll>
#define fi first
#define sc second
/* Vector Macro */
#define vi vector<int>
#define vll vector<ll>
#define pb push_back
/* All Rounder */
#define all(x) x.begin(),x.end()
#define forn(i,n) for(int (i) = 1; i<= int (n); i++)
#define for0(i,n) for(int (i) = 0; i < int (n); i++)
#define INF 1e9
#define LLINF 1e18
#define nl '\n'
#define tab ' '
using namespace std;
string guess_sequence(int N){
char a[9];
a[1] = 'A', a[2] = 'B', a[3] = 'X',a[4] = 'Y';
for(int i = 1; i<=4; i++)for(int j = 1; j<=4; j++)for(int k = 1; k<=4; k++){
string c ="";
c+= a[i];
c+=a[j];
c+=a[k];
if(press(c) == 3){
return c;
}
}
return string("");
}
