#include <bits/stdc++.h>
#define ll long long
#include "combo.h"
using namespace std;
string guess_sequence (int N)
{
string s="";
int res=press("AX");
if (res==0)
{
if (press("B")==1) s+='B';
else s+='Y';
}
else if (res==1)
{
if (press("X")==1) s+='X';
else s+='A';
}
else s+='A';
char c=s[0];
vector <char> mog(3);
if (c=='A') mog={'B', 'X', 'Y'};
else if (c=='B') mog={'A', 'X', 'Y'};
else if (c=='X') mog={'A', 'B', 'Y'};
else mog={'A', 'B', 'X'};
for (int i=1; i<=N; i++)
{
if (s.size()==N-1) break;
string p=(s+mog[1])+(s+mog[2]+mog[1])+(s+mog[2]+mog[0])+(s+mog[2]+mog[2]);
int res=press(p);
if (res==s.size()) s+=mog[0];
else if (res==s.size()+1) s+=mog[1];
else if (res==s.size()+2) s+=mog[2];
}
if (press(s+'X')==s.size())
{
if (press(s+'Y')==s.size()) s+='B';
else s+='Y';
}
else s+='X';
return s;
}
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