#include <bits/stdc++.h>
#include "combo.h"
using namespace std;
string guess_sequence(int n) {
string ans = "";
int x = press("AB");
if (x >= 1) {
int y = press("A");
if (y == 1) ans += 'A';
else ans += 'B';
} else {
int y = press("X");
if (y == 1) ans += 'X';
else ans += 'Y';
}
if (n == 1) return ans;
char a, b, c;
if (ans[0] == 'A') a = 'B', b = 'X', c = 'Y';
if (ans[0] == 'B') a = 'A', b = 'X', c = 'Y';
if (ans[0] == 'X') a = 'B', b = 'A', c = 'Y';
if (ans[0] == 'Y') a = 'B', b = 'X', c = 'A';
while (ans.size() < n - 1) {
//string s = ans;
int N = ans.size();
int y = press(ans + a + a + ans + a + b + ans + a + c + ans + c);
if (y == N + 2) ans += a;
else if (y == N + 1) ans += c;
else ans += b;
}
if (press(ans + a) == n) ans += a;
else if (press(ans + b) == n) ans += b;
else ans += c;
return ans;
}
