import java.util.ArrayDeque;
import java.util.Queue;
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 m = sc.nextInt();

		int[] dx = {1, 0, -1, 0};
		int[] dy = {0, 1, 0, -1};

		int[][] d = new int[n][n];
		d[0][0] = 1;
		d[n - 1][n - 1] = 1;
		Queue<Integer> que = new ArrayDeque<>();
		que.add(0);
		while (!que.isEmpty()) {
			int cur = que.poll();
			int cx = cur / n;
			int cy = cur % n;
			for (int i = 0; i < 4; i++) {
				int nx = cx + dx[i];
				int ny = cy + dy[i];
				if (nx < 0 || n <= nx || ny < 0 || n <= ny) {
					continue;
				}
				if (nx == n - 1 && ny == n - 1) {
					System.out.println("Yes");
					return;
				}
				if (d[nx][ny] == 0) {
					System.out.println((nx + 1) + " " + (ny + 1));
					String t = sc.next();
					if (t.equals("-1")) {
						return;
					} else if (t.equals("Black")) {
						d[nx][ny] = 1;
						que.add(nx * n + ny);
					} else {
						d[nx][ny] = 2;
					}
				}
			}
		}
		System.out.println("No");
	}
}