mod = 1000000007
eps = 10**-9


def main():
    import sys
    from heapq import heappush, heappop
    input = sys.stdin.readline

    def ask(h, w):
        print(h, w)
        sys.stdout.flush()
        return input().rstrip('\n')

    N, M = map(int, input().split())
    H = W = N
    Q = 3000
    pq = []
    heappush(pq, (N*2-3, 1))
    heappush(pq, (N*2-3, W))
    seen = [[0] * N for _ in range(N)]
    d = [(0, 1), (0, -1), (1, 0), (-1, 0)]
    M -= 2
    while Q:
        _, hw = heappop(pq)
        h, w = divmod(hw, N)
        if seen[h][w]:
            continue
        T = ask(h+1, w+1)
        Q -= 1
        if T == -1:
            exit()
        elif T == "Black":
            M -= 1
            for dh, dw in d:
                h_new, w_new = h+dh, w+dw
                if 0 <= h_new < H and 0 <= w_new < W:
                    if h_new == H-1 and w_new == W-1:
                        print("Yes")
                        exit()
                    p = H-1 - h_new + W-1 - w_new
                    if p - 1 <= M:
                        heappush(pq, (H-1 - h_new + W-1 - w_new, h_new*W+w_new))
    print("No")


if __name__ == '__main__':
    main()