#include <bits/stdc++.h>
using namespace std;
int press(string p);
string guess_sequence(int N) {
string known;
for (char c : {'A', 'B', 'X', 'Y'}) {
if (press(string(1, c)) == 1) {
known += c;
break;
}
}
for (int i = 1; i < N; ++i) {
for (char c : {'A', 'B', 'X', 'Y'}) {
if (c == known[0]) continue;
string attempt = known + c;
if (press(attempt) == attempt.size()) {
known += c;
break;
}
}
}
return known;
}
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