#include "combo.h"
using namespace std;
#include <string>
#include <vector>
#include <set>
string guess_sequence(int N) {
string ans = "";
set<string> strs = {"A", "B", "X", "Y"};
int ab = press("AB");
if(ab >= 1){
int a = press("A");
if(a == 1){
ans = "A";
}
else ans = "B";
}
else{
int x = press("X");
if(x == 1){
ans = "X";
}
else ans = "Y";
}
strs.erase(ans);
vector<string> left;
for(string s : strs){
left.emplace_back(s);
}
for(int i = 1; i < N - 1; ++i){
int cur = press(ans + left[1] + ans + left[2] + left[0] + ans + left[2] + left[1] + ans + left[2] + left[2]);
if(cur == i){
ans += left[0];
}
else if(cur == i + 1){
ans += left[1];
}
else ans += left[2];
}
int fst = press(ans + left[0] + ans + left[1]);
if(fst == N){
int zro = press(ans + left[0]);
if(zro == N){
ans += left[0];
}
else ans += left[1];
}
else ans += left[2];
return ans;
}
