#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")
#define _GLIBCXX_DEBUG
using namespace std;
using std::cout;
using std::cin;
using std::endl;
using ll=long long;
using ld=long double;
ll I=1167167167167167167;
ll Q=1e9+7;
#define rep(i,a) for (ll i=0;i<a;i++)
template<class T> using _pq = priority_queue<T, vector<T>, greater<T>>;
template<class T> ll LB(vector<T> &v,T a){return lower_bound(v.begin(),v.end(),a)-v.begin();}
template<class T> ll UB(vector<T> &v,T a){return upper_bound(v.begin(),v.end(),a)-v.begin();}
template<class T> bool chmin(T &a,const T &b){if(a>b){a=b;return 1;}else return 0;}
template<class T> bool chmax(T &a,const T &b){if(a<b){a=b;return 1;}else return 0;}
template<class T> void So(vector<T> &v) {sort(v.begin(),v.end());}
template<class T> void Sore(vector<T> &v) {sort(v.begin(),v.end(),[](T x,T y){return x>y;});}
template<class T> void print_tate(vector<T> &v) {rep(i,v.size()) cout<<v[i]<<"\n";}
void yneos(bool a){if(a) cout<<"Yes\n"; else cout<<"No\n";}



//おちこんだりもしたけれど、私はげんきです。
int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	
	int N,M;
	cin>>N>>M;
	vector<vector<int>> p(N+2,vector<int>(N+2));
	p[1][1]=1;
	p[N][N]=-2;
	queue<pair<int,int>> q;
	q.push({1,1});
	int J=1;
	int dx[]={1,-1,0,0};
	int dy[]={0,0,1,-1};
	rep(i,N+2) p[0][i]=-1,p[i][0]=-1,p[i][N+1]=-1,p[N+1][i]=-1;
	while(!q.empty()&&J){
		int a,b;
		tie(a,b)=q.front();
		q.pop();
		rep(i,4){
			int s=a+dx[i],t=b+dy[i];
			if(p[s][t]==-2){
				J=0;
				break;
			}
			if(p[s][t]==0){
				cout<<s<<" "<<t<<endl;
				string S;
				cin>>S;
				if(S[0]=='B'){
					p[s][t]=1;
					q.push({s,t});
				}
				else p[s][t]=-1;
			}
		}
	}
	yneos(!J);
	return 0;
}