#include <bits/stdc++.h>
#include "combo.h"
#define FOR(i,n) for(int i=0;i<n;i++)
#define FORE(i,a,b) for(int i=a;i<=b;i++)
#define ll long long
//#define int long long
#define ld long double
#define vi vector<int>
#define pb push_back
#define ff first
#define ss second
#define ii pair<int,int>
#define iii pair<ii,int>
#define il pair<ll,ll>
#define vv vector
#define endl '\n'
using namespace std;
string guess_sequence (int N){
const char s[] = "ABXY";
string ans="";
int length[N];
FOR(i,N){
FOR (j,4) {
length[j] = press(ans + s[j]);
}
FOR(j,4){
if(length[j] == i+1)ans+= s[j];
}
}
return ans;
}
