#include "combo.h"
#include <bits/stdc++.h>
using namespace std;
string guess_sequence(int N)
{
string s = "";///Empty string.
///Find first character.
if(press("AB"))
{
if(press("A"))
s+="A";
else s+="B";
}
else
{
if(press("X"))
s+="X";
else s+="Y";
}
///First character found.
char choices[3];
int poz = 0;
if(s[0]!='A')
choices[poz++] = 'A';
if(s[0]!='B')
choices[poz++] = 'B';
if(s[0]!='X')
choices[poz++] = 'C';
if(s[0]!='Y')
choices[poz++] = 'Y';
///Now we have all the choices.
for(int i = 2;i<N;i++)
{
string p=""; ///sA sBA
p =s + choices[0] + s + choices[1] + choices[0];
/// sBB
p = s + choices[1] + s + choices[1];
/// sBC
p = s + choices[1] + choices[2];
if(press(p)==i)
s+=choices[0];
else if(press(p)==i+1)
s+=choices[1];
else s+=choices[2];
}
///Now we need the last letter.
if(press(s+choices[0])==N)
s+=choices[0];
else if(press(s+choices[1])==N)
s+=choices[1];
else s+=choices[2];
return s;
}
