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

MAP=[[-1]*N for i in range(N)]

MAP[0][0]=1
MAP[N-1][N-1]=1

Q=[(0,0)]

c=0

while Q:
    x,y=Q.pop()
    if c==3000:
        break

    for z,w in [(x+1,y),(x-1,y),(x,y+1),(x,y-1)]:
        if 0<=z<N and 0<=w<N and MAP[z][w]==-1:
            print(z+1,w+1,flush=True)
            c+=1
            a=input()

            if a[0]=="B":
                MAP[z][w]=1
                Q.append((z,w))
            else:
                MAP[z][w]=0

        if c==3000:
            break

if MAP[N-2][N-1]==1 or MAP[N-1][N-2]==1:
    print("Yes",flush=True)
else:
    print("No",flush=True)