import sys
flush = sys.stdout.flush

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

# Black: 1
# White: 0
# unknown: -1
memo = [[-1] * (N + 2) for _ in range(N + 2)]
for i in range(N + 2):
    memo[i][0] = 0 
    memo[i][-1] = 0 
    memo[0][i] = 0 
    memo[-1][i] = 0 

memo[1][1] = 1
memo[N][N] = 1

def ask(i, j):
    if memo[i][j] != -1:
        return memo[i][j]
    print(f"{i} {j}")
    T = input()
    if T == "Black":
        memo[i][j] = 1
        return 1
    elif T == "White":
        memo[i][j] = 0
        return 0
    else:
        exit(-1)

stack = [(1, 1)]
visited = [[False] * (N + 2) for _ in range(N + 2)]
while stack:
    x, y = stack.pop()
    if ask(x, y) == 0 or visited[x][y]:
        continue
    visited[x][y] = True
    if x == y == N:
        print("Yes")
        exit(0)
    for dx, dy in zip((-1, 0, 1, 0), (0, 1, 0, -1)):
        nx = x + dx
        ny = y + dy
        stack.append((nx, ny))

    # print(stack)

print("No")