//https://ncode.syosetu.com/n4830bu/304/
#include <bits/stdc++.h>
using namespace std;

int main() {
    for (int i = 0;; i++) {
        cout << setw(3) << setfill('0') << i << endl;
        string s;
        cin >> s;
        if (s[0] == 'u')
            return 0;
    }
}