n,m=map(int,input().split())
q=[(1,2),(2,1)]
p=[[0]*(n+1)for i in range(n+1)]
p[1][1]=1
c=0
while q:
    a,b=q.pop()
    if (a,b)==(n,n):
        print('Yes',flush=True)
        exit()
    #show((a,b),q,p)
    print(a,b,flush=True)
    c+=1
    if input()=='Black':
        p[a][b]=1
        for u,v in [(-1,0),(1,0),(0,1),(0,-1)]:
            if 1<=a+u<=n and 1<=b+v<=n and p[a+u][b+v]==0:
                q+=(a+u,b+v),
                p[a+u][b+v]==-2
    else:
        p[a][b]=-1
    if c==3000:
        break
if (n,n)in q:
    print('Yes',flush=True)
    exit()
    
print('No',flush=True)