"""

500*500

黒マスから、次の黒マスを3回以内に見付けられればおk

"""

import sys
from sys import stdin
from collections import deque

def ask(x,y):

    if not (0 <= x < N and 0 <= y < N):
        return

    if ans[x][y] == None:
        print (x+1,y+1,flush=True)
        cat = stdin.readline()[:-1]

        if cat == "Black":
            ans[x][y] = 1
            q.append((x,y))
        elif cat == "White":
            ans[x][y] = 0
        else:
            assert False
            sys.exit()
        

N,M = map(int,stdin.readline().split())

ans = [[None] * N for i in range(N)]

q = deque()

ans[0][0] = 1
ans[-1][-1] = 1

q.append((0,0))

while q:

    x,y = q.popleft()
    ask(x-1,y)
    ask(x+1,y)
    ask(x,y-1)
    ask(x,y+1)

if ans[-2][-1] == 1 or ans[-1][-2] == 1:
    print ("Yes")
else:
    print ("No")