import collections

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

def query(r, c) -> bool:
    print(r, c)
    res = input()
    if res == '-1': exit()
    return res == 'Black'

def calc():
    q = collections.deque()
    q.append((1, 1))
    used = collections.defaultdict(bool)
    m = 0

    while len(q) > 0:
        r, c = q.popleft()
        if used[r, c]: continue
        used[r, c] = True
        if r == N and c == N: return True

        if m == 3000: return False
        black = query(r, c)
        m += 1

        if not black: continue
        for dr, dc in [(-1, 0), (1, 0), (0, -1), (0, 1)]:
            if not (1 <= r + dr <= N): continue
            if not (1 <= c + dc <= N): continue
            q.append((r + dr, c + dc))

ans = calc()
if ans:
    print('Yes')
else:
    print('No')