N, M = map(int, input().split())
D = [(-1, 0), (1, 0), (0, -1), (0, 1)]
Grid = [[0] * (N + 1) for _ in range(N + 1)]
Grid[1][1] = 1
Query = [(1, 1)]
while Query:
    H, W = Query.pop()
    print(H, W)
    Judge = input()
    if Judge == 'Black':
        for d1, d2 in D:
            h, w = H + d1, W + d2
            if h == N and w == N:
                print('Yes')
                exit()
            if h >= 1 and h <= N and w >= 1 and w <= N and not Grid[h][w]:
                Query.append((h, w))
                Grid[h][w] = 1
    elif Judge == '-1': exit()
print('No')