#include <bits/stdc++.h>
using namespace std;
typedef signed long long ll;

#define _P(...) (void)printf(__VA_ARGS__)
#define FOR(x,to) for(x=0;x<(to);x++)
#define FORR(x,arr) for(auto& x:arr)
#define FORR2(x,y,arr) for(auto& [x,y]:arr)
#define ALL(a) (a.begin()),(a.end())
#define ZERO(a) memset(a,0,sizeof(a))
#define MINUS(a) memset(a,0xff,sizeof(a))
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;}
//-------------------------------------------------------

int N,M;

int C[1010][1010];

void dfs(int y,int x) {
	if(y<0||y>=N||x<0||x>=N) return;
	if(C[y][x]>=0) return;
	cout<<y<<" "<<x<<endl;
	string s;
	cin>>s;
	C[y][x]=(s=="Black");
	
	if(C[y][x]) {
		dfs(y-1,x);
		dfs(y,x-1);
		dfs(y+1,x);
		dfs(y,x+1);
	}
	
	
}

void solve() {
	int i,j,k,l,r,x,y; string s;
	
	MINUS(C);
	
	cin>>N>>M;
	dfs(0,0);
	
	if(C[N-1][N-1]==1) {
		cout<<"Yes"<<endl;
	}
	else {
		cout<<"No"<<endl;
	}
}


int main(int argc,char** argv){
	string s;int i;
	if(argc==1) ios::sync_with_stdio(false), cin.tie(0);
	FOR(i,argc-1) s+=argv[i+1],s+='\n'; FOR(i,s.size()) ungetc(s[s.size()-1-i],stdin);
	cout.tie(0); solve(); return 0;
}