import sys
from collections import deque

n,m = map(int,input().split())
count = 0
q = deque([(1,0),(0,1)])
black = [[-1]*n for i in range(n)]
black[0][0] = black[-1][-1] = 1

while q and count < 3000:
    x,y = q.popleft()
    print(x+1,y+1)
    sys.stdout.flush()
    s = input()
    if s == "Black":
        black[x][y] = 1
        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:
                q.append((nx,ny))
    else:
        black[x][y] = 0
    count += 1
print("No")