import sys
from collections import deque

n,m = map(int,input().split())
count = 0

black = [[-1]*n for i in range(n)]
black[0][0] = black[-1][-1] = 1
q = deque([(0,0)])
while q and count < 3000:
    x,y = q.popleft()
    for dx,dy in ((0,1),(1,0),(0,-1),(-1,0)):
        nx = x+dx
        ny = y+dy
        if nx == ny == n-1:
            print("Yes")
            exit()
        if 0 <= nx < n and 0 <= ny < n and black[nx][ny] == -1:
            print(nx+1,ny+1)
            sys.stdout.flush()
            s = input()
            if s == "Black":
                black[nx][ny] = 1
                q.append((nx,ny))
            else:
                black[nx][ny] = 0
        count += 1
print("No")