#include<bits/stdc++.h>
#include "combo.h"
using namespace std;
#define ll int
#define pii pair<long long int,long long int>
#define vi vector<long long int >
#define vvi vector<vector< long long int>>
#define MP make_pair
#define PB push_back
#define pb pop_back
#define PF push_front
#define pf pop_front
#define MOD 1000000007
string guess_sequence(ll n)
{
string ans="";
ll co=1;
string a="B" , b="X" , c="Y";
if(press("A")==1)
{
ans="A";
}
else if(press("B")==1)
{
ans = "B";
a="A";
}
else if(press("X")==1)
{
ans= "X";
b="A";
}
else
{
ans="Y";
c="A";
}
if(n==1)
return ans;
while(co<n)
{
if(press(ans+a)==co+1)
{
ans = ans+a;
}
else if(press(ans+b)==co+1)
{
ans = ans+b;
}
else
ans =ans + c;
co++;
}
return ans;
}
