import sys
from collections import deque
sys.setrecursionlimit(10**7)
def I(): return int(sys.stdin.readline().rstrip())
def MI(): return map(int,sys.stdin.readline().rstrip().split())
def LI(): return list(map(int,sys.stdin.readline().rstrip().split()))
def LI2(): return list(map(int,sys.stdin.readline().rstrip()))
def S(): return sys.stdin.readline().rstrip()
def LS(): return list(sys.stdin.readline().rstrip().split())
def LS2(): return list(sys.stdin.readline().rstrip())


N,M = MI()

board = [[-1]*N for _ in range(N)]
board[0][0] = 1
board[-1][-1] = 1

directions0 = [(1,0),(0,1)]
directions1 = [(-1,0),(0,-1)]

deq = deque([(0,0)])
while deq:
    i,j = deq.pop()
    for di,dj in directions0:
        ni,nj = i+di,j+dj
        if not (0 <= ni < N and 0 <= nj < N):
            continue
        if ni == nj == N-1:
            print('Yes',flush=True)
            exit()
        if board[ni][nj] != -1:
            continue
        print(ni+1,nj+1,flush=True)
        T = S()
        if T == 'Black':
            board[ni][nj] = 1
            deq.append((ni,nj))
        else:
            board[ni][nj] = 0
    for di,dj in directions1:
        ni,nj = i+di,j+dj
        if not (0 <= ni < N and 0 <= nj < N):
            continue
        if ni == nj == N-1:
            print('Yes',flush=True)
            exit()
        if board[ni][nj] != -1:
            continue
        print(ni+1,nj+1,flush=True)
        T = S()
        if T == 'Black':
            board[ni][nj] = 1
            deq.appendleft((ni,nj))
        else:
            board[ni][nj] = 0