#include <bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
#include "combo.h"
//#define int long long
typedef pair<int,int> pii;
typedef vector<int> vi;
typedef vector<pii> vii;
typedef vector<bool> vb;
typedef long long ll;
typedef pair<ll,ll> pll;
typedef vector<pll> vll;
typedef tree<pii,null_type,less<pii>,rb_tree_tag,
tree_order_statistics_node_update> oset;
#define fi first
#define se second
#define pb push_back
#define pf push_front
#define mid (l+r)/2
#define all(x) x.begin(),x.end()
#define FOR(i,a) for(int i=0;i<(a);i++)
#define FORE(i,a,b) for(int i=(a);i<(b);i++)
#define cont(x) for(auto el:x) cout<<el<<' ';cout<<endl;
#define contp(x) for(auto el:x) cout<<el.fi<<'-'<<el.se<<' ';cout<<endl;
#define sp <<" "<<
#define DEBUG(x) cout<<(#x) sp x<<endl
#define carp(a,b) (((a%MOD)*(b%MOD))%MOD)
#define topla(a,b) (((a%MOD)+(b%MOD))%MOD)
const ll INF=1e18;
const int MAXN=1e5+5;
const int MOD=1e9+7;
string guess_sequence(int n){
set<char> s;
s.insert('A');
s.insert('B');
s.insert('X');
s.insert('Y');
string res="";
int deg=press("XA");
if(deg==0){
deg=press("Y");
if(deg==0) res+='B';
else res+='Y';
}
else{
deg=press("X");
if(deg==0) res+='A';
else res+='X';
}
s.erase(res[0]);
auto it=s.begin();
char c1=*it;
it++;
char c2=*it;
it++;
char c3=*it;
FORE(i,2,n){
string temp;
for(auto el:s){
temp+=res;
temp+=c1;
temp+=el;
}
temp+=res;
temp+=c2;
deg=press(temp);
if(deg==i+1){
res+=c1;
}
else if(deg==i){
res+=c2;
}
else{
res+=c3;
}
}
string temp;
temp+=res;
temp+=c1;
temp+=res;
temp+=c2;
deg=press(temp);
if(deg==n-1) res+=c3;
else{
temp.clear();
temp+=res;
temp+=c1;
deg=press(temp);
if(deg==n-1) res+=c2;
else res+=c1;
}
return res;
}
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