#include "combo.h"
#pragma GCC optimize("Ofast,unroll-loops")
#include<bits/stdc++.h>
//#define int long long
#define ll long long
#define down cout<<'\n';
#define debug cout<<" cucuucucuuu",down
#define modwwe int t;cin>>t; while(t--)
#define bit(i,j) (i>>j&1)
#define sobit(a) __builtin_popcountll(a)
#define task2 "ftree"
#define task "test"
#define fin(x) freopen(x".inp","r",stdin)
#define fou(x) freopen(x".out","w",stdout)
#define pb push_back
#define mask(k) (1<<k)
#define checktime cerr << (double)clock() / CLOCKS_PER_SEC * 1000 << " ms";
using namespace std;
#define getchar_unlocked getchar
mt19937 rd(chrono::steady_clock::now().time_since_epoch().count());
int rand(int l,int r)
{
return uniform_int_distribution<int>(l,r)(rd);
}
void phongbeo();
const int inf = 1e16;
const ll mod2 = 1e9+7;
const ll base=67;
int n,m,s1, s2, s4, s3, sf, k, s5, s6, mx, s7, s8, s9, mx2, res, dem2 = 0, dem = 0, s33, dem3, dem4, mid, l2, r2, center;
int i, s10, s12,k1,k2,k3,s11,lim,w,l,r,last;
int kk;
int t;
int el = 19;/*
main()
{
if(fopen(task2".inp","r"))
{
fin(task2);
fou(task2);
}
if(fopen(task".inp","r"))
{
fin(task);
fou(task);
}
ios_base::sync_with_stdio(0);
cout.tie(0);
cin.tie(0);
/// cin>>s1;
//int t;cin>>t; while(t--)
phongbeo(),down
// checktime
}
int press(string s)
{
return 0;
}*/
string guess_sequence(int n)
{
string s;
string start="ABXY";
if(press("AB"))
{
if(press("A"))s='A';
else s='B';
}
else
{
if(press("X"))s='X';
else s='Y';
}
if(n==1) return s;
string nex;
for(char x:start)
if(x!=s[0])
nex+=x;
while(s.size()+1<n)
{
string ask=s+nex[0]+nex[0]+s+nex[0]+nex[1]+s+nex[0]+nex[2]+s+nex[1];
int hihi=press(ask);
if(hihi==s.size()+2)
{
s=s+nex[0];
}
else if(hihi==s.size()+1)
{
s=s+nex[1];
}
else
{
s=s+nex[2];
}
}
string ask=s+nex[0];
if(press(ask)==n)
{
s=s+nex[0];
return s;
}
ask=s+nex[1];
if(press(ask)==n)
{
s=s+nex[1];
return s;
}
s=s+nex[2];
return s;
}
