#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 = s ;
for(int i = 0 ; i < 4*n-1 ; i++ ) s2.pb(buttons[0]);
int ans = press ( s2 ) ;
while ( ans > (int)s.length() ) s.pb(buttons[0]) ;
s2=s ;
for(int i = 0 ; i < 4*n-1 ; i++ ) s2.pb(buttons[1]);
ans = press ( s2 ) ;
while ( ans > (int)s.length() ) s.pb(buttons[1]) ;
s2=s ;
for(int i = 0 ; i < 4*n-1 ; i++ ) s2.pb(buttons[2]);
ans = press ( s2 ) ;
while ( ans > (int)s.length() ) s.pb(buttons[2]) ;
}
assert( (int)s.length() == n) ;
return s ;
}
