#include <iostream>
#include <iomanip>
#include <string>

using namespace std;

int main() {
    int key;
    string rep;

    for (key = 0; key < 1000; key++) {
        cout << setfill('0') << setw(3) << key << endl;
        cin >> rep;

        if(rep == "unlocked") {
            return 0;
        }
    }

    return 0;
}