#include "combo.h"
#include <bits/stdc++.h>
#include <bits/extc++.h>
using namespace __gnu_pbds;
using namespace std;
// #pragma GCC optimize("Ofast")
// #pragma GCC optimize ("unroll-loops")
// #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#define ff first
#define sc second
#define pb push_back
#define ll long long
#define pll pair<ll, ll>
#define pii pair<int, int>
#define ull unsigned long long
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
mt19937_64 rngl(chrono::steady_clock::now().time_since_epoch().count());
// #define int long long
// #define int unsigned long long
// #define ordered_set(T) tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>
// #define ordered_multiset(T) tree<T, null_type, less_equal<T>, rb_tree_tag, tree_order_statistics_node_update>
const ll mod = 1e9 + 7;
// const ll mod = 998244353;
const ll inf = 1e9;
const ll biginf = 1e18;
const int maxN = 4 * 1e5 + 15;
// namespace {
// constexpr int MAX_N = 2000;
// constexpr int MAX_NUM_MOVES = 8000;
// int N;
// std::string S;
// int num_moves;
// void wrong_answer(const char *MSG) {
// printf("Wrong Answer: %s\n", MSG);
// exit(0);
// }
// } // namespace
// int press(std::string p) {
// cout << p << '\n';
// if (++num_moves > MAX_NUM_MOVES) {
// wrong_answer("too many moves");
// }
// int len = p.length();
// if (len > 4 * N) {
// cout << p; wrong_answer("invalid press");
// }
// for (int i = 0; i < len; ++i) {
// if (p[i] != 'A' && p[i] != 'B' && p[i] != 'X' && p[i] != 'Y') {
// cout << p; wrong_answer("invalid press");
// }
// }
// int coins = 0;
// for (int i = 0, j = 0; i < len; ++i) {
// if (j < N && S[j] == p[i]) {
// ++j;
// } else if (S[0] == p[i]) {
// j = 1;
// } else {
// j = 0;
// }
// coins = std::max(coins, j);
// }
// return coins;
// }
string guess_sequence(int n) {
string s, ans;
int ret = press("AB");
if (ret == 2) ans += "AB";
else if (ret == 1) {
ret = press("A");
if (ret == 1) ans += "A";
else ans += "B";
} else {
ret = press("X");
if (ret == 1) ans += "X";
else ans += "Y";
}
if (ans.size() == n) return ans;
vector<string> vec;
if (ans[0] != 'A') vec.pb("A");
if (ans[0] != 'B') vec.pb("B");
if (ans[0] != 'X') vec.pb("X");
if (ans[0] != 'Y') vec.pb("Y");
while (ans.size() + 1 < n) {
s = ans + vec[0] + ans + vec[1] + vec[0] + ans + vec[1] + vec[1] + ans + vec[1] + vec[2];
int ret = press(s);
if (ret == (int)ans.size()) ans += vec[2];
if (ret == (int)ans.size() + 1) ans += vec[0];
if (ret == (int)ans.size() + 2) ans += vec[1];
}
if (press(ans + vec[0]) == n) ans += vec[0];
else if (press(ans + vec[1]) == n) ans += vec[1];
else ans += vec[2];
return ans;
}
// int main() {
// char buffer[MAX_N + 1];
// if (scanf("%s", buffer) != 1) {
// fprintf(stderr, "Error while reading input\n");
// exit(1);
// }
// S = buffer;
// N = S.length();
// num_moves = 0;
// std::string answer = guess_sequence(N);
// if (answer != S) {
// cout << answer;
// wrong_answer("wrong guess");
// exit(0);
// }
// printf("Accepted: %d\n", num_moves);
// return 0;
// }
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