import sys
sys.setrecursionlimit(10 ** 9)

n, m = map(int, input().split())
directions = [(1, 0), (0, 1), (0, -1), (-1, 0)]

used = [[False] * n for _ in range(n)]
def dfs(i, j):
    global m
    for di, dj in directions:
        ni = i + di
        nj = j + dj
        if ni == -1 or nj == -1 or ni == n or nj == n:
            continue
        if used[ni][nj]:
            continue
        if nj == n - 1 and nj == n - 1:
            print("Yes")
            exit()
        used[ni][nj] = True
        print(ni + 1, nj + 1, flush = True)
        t = input()
        if t == "-1":
            exit()
        elif t == "Black":
            dfs(ni, nj)
        else:
            m -= 1
            if m == 0:
                print("No")
                exit()
    
    
    
used[0][0] = True
used[-1][-1] = True
dfs(0, 0)
print("No")