#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
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" ;
while ( (int)s.length() != n ){
string s2 ;
int ans ;
if( (int) s.length() == n-1 ) {
s2 = s + buttons[0] + s + buttons[1];
if( press ( s2 ) == (int)s.length() ){
s.pb(buttons[2]) ;
break ;
}
s2 = s + buttons[1] ;
if( press ( s2 ) == (int)s.length() + 1 ){
s.pb(buttons[1]) ;
break ;
}
s += buttons[0] ;
break ;
}
else
s2 = s + buttons[0] + s + buttons[1] + buttons[0] + s + buttons[1] + buttons[1] + s + buttons[1] + buttons[2] ;
ans = press ( s2 ) ;
if( ans == (int)s.length() ){
s.pb(buttons[2]) ;
}else if( ans == (int)s.length() + 1 ){
s.pb(buttons[0]) ;
}else if( ans == (int)s.length() + 2 ){
s.pb(buttons[1]);
}
}
assert( (int)s.length() == n) ;
return s ;
}
