#include<iostream>
#include<string>
#include<cctype>

int main() {
	std::string ans = "0000000000";
	std::cout << ans << std::endl;
	int ans_num;
	std::string result;
	std::cin >> ans_num >> result;
	if (result == "unlocked") return 0;

	int prev_ans = ans_num;
	for (int i = 0; i < ans.size(); i++) {
		for (int j = 0; j < 10; j++) {
			ans[i] = '0' + j;
			std::cout << ans << std::endl;
			std::cin >> ans_num >> result;

			if (result == "unlocked") return 0;
			if (ans_num > prev_ans) break;
			if (ans_num < prev_ans) {
				ans[i] = '0' + (j - 1);
				break;
			}
		}
	}
}