import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		StringBuilder key = new StringBuilder("0000000000");
		System.out.println(key.toString());
		int X = scan.nextInt();
		String t = scan.next();
		if(t.equals("unlocked")) {
			System.exit(0);
		}
		for(int i = 0; i < 10; i++) {
			String s0 = key.toString();
			for(int j = 1; j < 10; j++) {
				String s = key.replace(i, i + 1, Integer.toString(j)).toString();
				System.out.println(s);
				int k = scan.nextInt();
				t = scan.next();
				if(t.equals("unlocked")) {
					System.exit(0);
				}
				if(k > X) {
					key = new StringBuilder(s);
					break;
				}else if(k < X) {
					key = new StringBuilder(s0);
					break;
				}
			}
		}
		scan.close();
	}
}