#include "combo.h"
#include<bits/stdc++.h>
using namespace std;
std::string guess_sequence(int N) {
string s="";
vector<string>op;
if(press("AB")>=1) {
if(press("A")==1){
s+='A';
op={"BB","BX","BY","X"};
}
else{
s+='B';
op={"AA","AX","AY","X"};
}
}
else if(press("X")==1){
s+='X';
op={"BB","BA","BY","A"};
}
else{
s+='Y';
op={"BB","BX","BA","X"};
}
//cout<<s<<"\n";
for (int i = 1; i < N-1; ++i) {
string ns=s+string(op[0])+s+string(op[1])+s+string(op[2])+s+string(op[3]);
int c=press(ns);
int t=s.size();
if(s[0]=='A'){
if(c==t) s+='Y';
else if(c==t+1) s+='X';
else s+='B';
}
else if(s[0]=='B'){
if(c==t) s+='Y';
else if(c==t+1) s+='X';
else s+='A';
}
else if(s[0]=='X'){
if(c==t) s+='Y';
else if(c==t+1) s+='A';
else s+='B';
}
else{
if(c==t) s+='A';
else if(c==t+1) s+='X';
else s+='B';
}
}
//cout<<s<<"\n";
if(N==1) return s;
if(press(s+'A'+s+'B')==N){
if(press(s+'A')==N) s+='A';
else s+='B';
}
else{
if(press(s+'X')==N) s+='X';
else s+='Y';
}
return s;
}
