#ifdef LOCAL
#include <cstdio>
#include <cstdlib>
#include <algorithm>
#include <string>
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) {
if (++num_moves > MAX_NUM_MOVES) {
wrong_answer("too many moves");
}
int len = p.length();
if (len > 4 * N) {
wrong_answer("invalid press");
}
for (int i = 0; i < len; ++i) {
if (p[i] != 'A' && p[i] != 'B' && p[i] != 'X' && p[i] != 'Y') {
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;
}
#endif // LOCAL
#ifndef LOCAL
#include "combo.h"
#endif // LOCAL
#include<bits/stdc++.h>
using namespace std;
string guess_sequence(int N)
{
string res;
char first;
string can = "ABXY";
if(press("AB")){
if(press("A"))
first = 'A';
else first = 'B';
}
else{
if(press("X"))
first = 'X';
else first = 'Y';
}
res += first;
can.erase(can.find(first), 1);
if(N == 1) return res;
for(int i = 2; i < N; ++i){
int now = press(res + can[0] + res + can[1] + can[0] + res + can[1] + can[1] + res + can[1] + can[2]);
if(now == i - 1) res += can[2];
else if(now == i) res += can[0];
else res += can[1];
}
if(press(res + can[0]) == N) res += can[0];
else if(press(res + can[1]) == N) res += can[1];
else res += can[2];
return res;
}
#ifdef LOCAL
int main() {
if(fopen("A.INP", "r")) freopen("A.INP", "r", stdin);
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) {
wrong_answer("wrong guess");
exit(0);
}
printf("Accepted: %d\n", num_moves);
return 0;
}
#endif // LOCAL
