from collections import deque

N,M = map(int,input().split())

#-1: 白確定  0: 不明  1: 黒確定
G = [[0] * (N+1) for _ in range(N+1)]
for h in range(N+1):
  G[h][0] = -1
  G[0][h] = -1
G[1][1] = 1
M -= 2

Q = deque([(1,2),(2,1)])
while Q:
  h,w = Q.popleft()
  if G[h][w] != 0: continue
  if h == w == N:
    print('Yes')
    exit()
  if M == 0: continue
  M -= 1
  print(h,w)
  a = input()
  G[h][w] = -1 if a == 'White' else 1
  if G[h][w] == -1: continue
  for x,y in[(h-1,w),(h+1,w),(h,w-1),(h,w+1)]:
    if x in range(1, N+1) and y in range(1, N+1):
      Q.append((x,y))
print('No')