#pragma GCC optimize("O3")
#include<bits/stdc++.h> 
using namespace std;
using ll=long long;
using P=pair<ll,ll>;
template<class T> using V=vector<T>; 
#define fi first
#define se second
#define all(v) (v).begin(),(v).end()
const ll inf=(1e18);
//const ll mod=998244353;
const ll mod=1000000007;
const vector<int> dy={-1,0,1,0},dx={0,-1,0,1};
ll GCD(ll a,ll b) {return b ? GCD(b,a%b):a;}
ll LCM(ll c,ll d){return c/GCD(c,d)*d;}
//struct __INIT{__INIT(){cin.tie(0);ios::sync_with_stdio(false);cout<<fixed<<setprecision(15);}} __init;
template<class T> bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T> bool chmin(T &a, const T &b) { if (a>b) { a=b; return 1; } return 0; }
template<class T>void debag(const vector<T> &a){cerr<<"debag :";for(auto v:a)cerr<<v<<" ";cerr<<"\n";}
template<class T>void print(const vector<T> &a){for(auto v:a)cout<<v<<" ";cout<<"\n";}
int main(){
    int n,m;
    cin>>n>>m;
    V<V<bool>> vis(n,V<bool>(n,false));
    vis[0][0]=true;
    V<V<int>> res(n,V<int>(n,-1));
    res[0][0]=1;
    res[n-1][n-1]=1;
    queue<P> q;
    q.emplace(0,0);
    int cnt=0;
    while(q.size()){
          int y=q.front().fi,x=q.front().se;
          q.pop();
          for(int i=0;i<4;i++){
               int ny=y+dy[i],nx=x+dx[i];
               if(ny<0||ny>=n||nx<0||nx>=n||vis[ny][nx])continue;
               if(res[ny][nx]==1){
                     vis[ny][nx]=true;
                     q.emplace(ny,nx);
               }
               if(res[ny][nx]!=-1)continue;
               if(cnt<3000){
                     cout<<ny+1<<" "<<nx+1<<"\n";
                     string s;
                     cin>>s;
                     if(s=="White"){
                          res[ny][nx]=0;
                     }else if(s=="Black"){
                           vis[ny][nx]=true;
                           res[ny][nx]=1;
                           q.emplace(ny,nx);
                     }else{
                         exit(1);
                     }
               }
          }
    }
    cout<<(vis[n-1][n-1]?"Yes":"No")<<"\n";
}