#include <iostream>
#include <string>
#include <vector>
#include <cmath>
#include <algorithm>
#include <cstdlib>
#include <ctime>
#include <cstdio>
#include <functional>
#include <set>
#include <sstream>
#include <map>
#include <queue>
#include <stack>

using namespace std;

int main(){

    for(int i=0;i<1000;i++){
        stringstream ss;
        ss<<i;
        string out=ss.str();
        while(out.size()!=3) out='0'+out;
        cout<<out<<endl;
        cout.flush();
        
        string res;
        cin>>res;
        if(res[0]=='u') break;
    }

    return 0;

}