#include <bits/stdc++.h>
#define GET_MACRO(a, b, c, NAME, ...) NAME
#define rep(...) GET_MACRO(__VA_ARGS__, rep3, rep2)(__VA_ARGS__)
#define rep2(i, a) rep3 (i, 0, a)
#define rep3(i, a, b) for (int i = (a); i < (b); i++)
#define repr(...) GET_MACRO(__VA_ARGS__, repr3, repr2)(__VA_ARGS__)
#define repr2(i, a) repr3 (i, 0, a)
#define repr3(i, a, b) for (int i = (b) - 1; i >= (a); i--)
#define chmin(a, b) ((b) < a && (a = (b), true))
#define chmax(a, b) (a < (b) && (a = (b), true))
using namespace std;
typedef long long ll;

int main() {
	string ans(10, '0');
	rep (i, 10) {
		cout << ans << endl;
		int num;
		string s;
		cin >> num >> s;
		if (s == "unlocked") return 0;
		rep (j, 10) {
			string ans2 = ans;
			ans2[i] = '0' + j;
			int num2;
			string s2;
			cout << ans2 << endl;
			cin >> num2 >> s2;
			if (s2 == "unlocked") return 0;
			if (num2 < num) {
				break;
			} else if (num2 > num) {
				ans = ans2;
				break;
			}
		}
	}
	cout << ans << endl;
	int a;
	string b;
	cin >> a >> b;
	return 0;
}