import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int n2 = n * 2;
		for (int i = 0; i < n2; i++) {
			System.out.println("D");
			int v = sc.nextInt();
			if (v != 0) {
				break;
			}

			System.out.println("R");
			v = sc.nextInt();
			if (v != 0) {
				break;
			}
		}
		sc.close();
	}
}