#include <iostream>
#include <cstdio>
#include <string>
#include <cstring>
#include <algorithm>
#include <vector>
#include <map>
#include <set>
#include <stack>
#include <queue>
#include <functional>
#include <cmath>
#ifndef ONLINE_JUDGE
# include <complex>
# include <random>
# include <array>
# include <unordered_map>
# define mkt make_tuple
#endif
#ifdef _LOCAL
# include "module/for_local.h"
#else
# define assert(...) ((void)0)
# define ifdebug if (false)
# define echo(...) ((void)0)
#endif
using namespace std;
typedef long long ll; typedef unsigned long long ull;
#define repi(_I, _B, _E) for(int _I = (_B); (_I) < (_E); ++ (_I))
#define rep(_I, _N) for(int _I = 0; (_I) < (_N); ++ (_I))
#define all(_X) (_X).begin(), (_X).end()

string key = "0000000000";

pair<int, bool> query()
{
	cout << key << endl;

	int n;
	static char msg[10] {};
	cin >> n >> msg;
	return { n, ! strcmp(msg, "unlocked") };
}

int main()
{
	int n;
	bool unlocked;

	rep(i, 10)
	{
		int mi = 1<<29;
		char mi_d;
		for ( char d = '0'; d <= '9'; d++ )
		{
			key[i] = d;
			tie(n, unlocked) = query();
			if ( unlocked ) return 0;

			if ( mi >= n ) {
				mi = n;
				mi_d = d;
			}
		}
		key[i] = mi_d;
	}
	return 0;
}