#include "combo.h"
#include <bits/stdc++.h>
/* DEFINES */
#define F first
#define S second
#define ll long long
#define ull unsigned long long
#define ld long double
#define npos ULLONG_MAX
#define INF LLONG_MAX
#define vv(a) vector<a>
#define pp(a, b) pair<a, b>
#define pq(a) priority_queue<a>
#define qq(a) queue<a>
#define ss(a) set<a>
#define mm(a, b) map<a, b>
#define ump(a, b) unordered_map<a, b>
#define sync \
ios_base::sync_with_stdio(0); \
cin.tie(0); \
cout.tie(0);
#define elif else if
#define endl "\n"
#define allc(a) begin(a), end(a)
#define all(a) a, a + sizeof(a) / sizeof(a[0])
#define pb push_back
#define logi(a) __lg(a)
#define sqrt(a) sqrtl(a)
#define mpr make_pair
#define ins insert
using namespace std;
using namespace __cxx11;
typedef char chr;
typedef basic_string<chr> str;
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
str guess_sequence(int n)
{
str p;
str dx = "AXYB";
for (ll i = 0; i < n; i++)
{
for (ll k = 0; k < 4; k++)
{
p += dx[k];
if (press(p) == i + 1)
break;
p.pop_back();
}
}
return p;
}
