#include "combo.h"
#include<bits/stdc++.h>
using namespace std;
std::string guess_sequence(int N) {
string ans,s,s1;
int a,n;
n=N;
if(press("AB")>=1) {
if(press("A")==1) { ans="A"; s1="BXY"; }
else { s1="AXY"; ans="B"; }
}
else if(press("X")==1) { ans="X"; s1="ABY"; }
else { s1="ABX"; ans="Y"; }
for(long long i=2;i<n;i++) {
s=ans+s1[0]+ans+s1[1]+s1[0]+ans+s1[1]+s1[1]+ans+s1[1]+s1[2];
a=press(s);
if(a==i-1) ans+=s1[2];
else if(a==i) ans+=s1[0];
else ans+=s1[1];
}
s=ans+s1[0]+ans+s1[1];
if(press(s)==n) {
s=ans+s1[0];
if(press(s)==n) ans=ans+s1[0];
else ans=ans+s1[1];
}
else ans=ans+s1[2];
return ans;
}
