n,m=map(int,input().split())
s=[[-1]*(n+1) for i in range(n+1)]
s[1][1]=1
s[n][n]=1
delta=[(1,0),(-1,0),(0,1),(0,-1)]
from _collections import deque


dp=[[10**18]*(n+1) for i in range(n+1)]
dp[1][1]=0
data=deque([(1,1)])
while data:
    i,j=data.popleft()
    for di,dj in delta:
        if not (1<=i+di<=n and 1<=j+dj<=n):continue
        x=i+di
        y=j+dj
        if s[x][y]==-1:
            print(x,y)
            t=input()
            if t[0]=="B":
                s[x][y]=1
            else:
                s[x][y]=0
        if s[x][y]==1 and dp[x][y]>dp[i][j]+1:
            dp[x][y]=dp[i][j]+1
            data.append((x,y))

print("Yes" if dp[n][n]<10**17 else "No")