#include <bits/stdc++.h>

using namespace std;

int main() {
    std::mt19937 rand2(static_cast<unsigned int>(time(nullptr)));
    std::uniform_int_distribution<int> dist(0, 999);

    while (1) {
        int keyNo = dist(rand2);
        cout << setfill('0') << setw(3);
        cout << keyNo << endl;

        string s;
        cin >> s;
        if (s == "unlocked") return 0;
    }
}