#include <bits/stdc++.h>
#include "combo.h"
using namespace std;
#define mp make_pair
#define fi first
#define se second
#define all(v) v.begin(),v.end()
#define allarr(a) a , a + n
#define pb push_back
/*int press (string s ){cout<<"query "<<s<<endl;
int x ; cin>> x ; return x ;
}*/
string guess_sequence (int n){
string buttons ,s;
if( press("A")==1 ) s.pb('A') , buttons = "BXY" ;
else if( press("B")==1 ) s.pb('B') , buttons = "AXY" ;
else if( press("X")==1 ) s.pb('X') , buttons = "ABY" ;
else s.pb('Y' ) , buttons = "ABX" ;
for(int i = 1 ; i < n ; i++ ){
//cout<<i<<" "<<s<<endl;
if( i == 1 ) {
for( char b : buttons ){
int ans = press ( s + b + buttons[0] ) ;
if( ans == i+1 ){
s+=b ; break ;
}
if( ans == i+2 ) {
s+= b ;
s+= buttons[0] ;
i ++ ;
break ;
}
}
continue ;
}
int ans = press ( s + buttons[1] + buttons[0] ) ;
if( ans == i + 2 ){
s += buttons[1] ;
if( i != n-1 ) s+= buttons[0] ;
i++ ;
}
else if( ans == i + 1 ) s += buttons[1] ;
else s += buttons[2] ;
}
return s ;
}
/*
int main(){int n ; cin>> n ;
cout<<"answer is "<<guess_sequence(n)<<endl;
}*/
