#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" ;
char c = buttons.back () ;
buttons.pop_back () ;
for(int i = 1 ; i < n ; i++ ){
int ans , ok = 1;// cout<<i<< " " << s <<endl ;
for(char b : buttons ){
ans = press ( s + b ) ;
if( ans == i + 1 ){
s += b ;ok = 0 ;
break ;
}
}if( ok )
s += c ;
}
assert( (int)s.length() == n) ;
return s ;
}
