def query(a,b):
    print(f"{a+1} {b+1}",flush=1)
    if DEBUG:
        return a!=1 or b!=1
    else:
        return input() == "Black"

DEBUG = 0
n,m = map(int,input().split())
b = [[0]*n for _ in range(n)]
b[0][0] = b[-1][-1] = 1
q = [(0,0)]
while q:
    i,j = q.pop()
    for ni,nj in [(i-1,j),(i,j-1),(i+1,j),(i,j+1)]:
        if ni == nj == n-1:
            print("Yes")
            exit()
        if 0 <= ni < n and 0 <= nj < n and b[ni][nj] == 0:
            b[ni][nj] = 1
            if query(ni,nj):
                q.append((ni,nj))
print("No")