#include "combo.h"
#include<bits/stdc++.h>
using namespace std;
#define F first
#define S second
#define all(x) x.begin(),x.end()
#define pii pair<int,int>
#define pb push_back
#define sz(x) (int)(x.size())
#define chmin(x,y) x=min(x,y)
#define chmax(x,y) x=max(x,y)
#define vi vector<int>
#define vp vector<pii>
#define vvi vector<vi>
#define ykh mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count())
#define __lg(x) 63-__builtin_clzll(x)
#define pow2(x) (1LL<<x)
string guess_sequence(int n){
string s;
vector<char>v={'A','B','X','Y'};
string temp="AB";
int res=press(temp);
if(res>0){
temp="A";
res=press(temp);
if(!res)swap(v[0],v[1]);
}
else{
temp="X";
res=press(temp);
if(res)swap(v[0],v[2]);
else swap(v[0],v[3]);
}
s+=v[0];
if(n==1){
return s;
}
for(int i=1;i+1<n;i++){
temp=s+v[1]+v[1]+s+v[1]+v[2]+s+v[1]+v[3]+s+v[3];
res=press(temp);
if(res==i+2)s+=v[1];
else if(res==i+1)s+=v[3];
else s+=v[2];
}
if(press(s+v[1])==n)s+=v[1];
else if(press(s+v[2])==n)s+=v[2];
else s+=v[3];
return s;
}
/*
input:
*/
