#include "combo.h"
#include<bits/stdc++.h>
using namespace std;
char key[] = { 'A','B','X','Y' };
string guess_sequence(int N) {
string s = "";
char element[3];
int pos = 0;
int idx = 0;
if (press("AB") >= 1) {
if (press("A") >= 1) {
s = "A";
idx = 0;
}
else {
s = "B";
idx = 1;
}
}
else {
if (press("XY") >= 1) {
if (press("X") >= 1) {
s = "X";
idx = 2;
}
else {
s = "Y";
idx = 3;
}
}
}
if (N == 1) return s;
for (int i = 0; i <= 3; i++) {
if (idx == i) continue;
element[pos++] = key[i];
}
for(int i=1;i<=N-2;i++){
string p = s + element[0] + element[0] + s + element[0] + element[1] + s + element[0] + element[2] + s + element[1];
int cnt = press(p);
if (cnt == i+2) s = s + element[0];
else if (cnt == i + 1) s = s + element[1];
else if(cnt==1) s = s + element[2];
}
if (press(s + element[0]) ==N ) s = s + element[0];
else if (press(s + element[1]) == N) s = s + element[1];
else s = s + element[2];
return s;
}
