#include "combo.h"
#include<bits/stdc++.h>
using namespace std;
/*int press(string s)
{
cout<<s<<endl;
int x;
cin>>x;
return x;
}*/
string guess_sequence(int n)
{
string ans;
int x = press("AB");
if(x == 0){
int se = press("X");
if(se == 1) ans += "X";
else ans += "Y";
}
else{
int se = press("A");
if(se == 1) ans += "A";
else ans += "B";
}
vector<string> c;
if(ans != "A") c.push_back("A");
if(ans != "B") c.push_back("B");
if(ans != "X") c.push_back("X");
if(ans != "Y") c.push_back("Y");
int i = 1;
while(i < n){
if(i == n-1){
int fi = press(ans+"AB")-ans.size();
if(fi == 0){
int se = press(ans+"X")-ans.size();
if(se == 1) ans += "X";
else ans += "Y";
}
else{
int se = press(ans+"A")-ans.size();
if(se == 1) ans += "A";
else ans += "B";
}
break;
}
int a = press(ans + c[0] + c[0] + ans + c[0] + c[1] + ans + c[1] + c[0])-ans.size();
if(a == 0){
ans += c[2];
}
else if(a == 1){
int b = press(ans + c[1] + c[1])-i;
if(b == 0) ans += c[0] + c[2];
else if(b == 1) ans += c[1] + c[2];
else ans += c[1] + c[1];
i++;
}
else{
int b = press(ans + c[0] + c[0])-i;
if(b == 0) ans += c[1] + c[0];
else if(b == 1) ans += c[0] + c[1];
else ans += c[0] + c[0];
i++;
}
i++;
}
return ans;
}
/*int main()
{
int n;
cin>>n;
cout<<guess_sequence(n);
}*/
