#include<bits/stdc++.h>
using namespace std;
using ll = long long int;
using ld = long double;
const ll MAX = 5000000000000000000;
const ld PI = 3.14159265358979;
const ll MOD = 0;//2024948111;
random_device rd;
mt19937 mt(rd());
ld dotorad(ld K){return PI * K / 180.0;}
ld radtodo(ld K){return K * 180.0 / PI;}
vector<vector<ll>> G(600,vector<ll>(600,-1));
void tell(ll x,ll y){
    if(G[x][y] != -1) return;
    string a;
    cout << x + 1 << " " << y + 1 << endl;
    cin >> a;
    G[x][y] = (a == "Black");
}
int main(){
    ll N,M;
    cin >> N >> M;
    queue<tuple<ll,ll>> que;
    que.push(make_tuple(0,0));
    while(!que.empty()){
        ll a = get<0>(que.front());
        ll b = get<1>(que.front());
        que.pop();
        if(a == N - 1 && b == N - 1){
            cout << "Yes" << endl;
            return 0;
        }
        if(0 <= a && a < N && 0 <= b && b < N && G[a][b] == -1){
            tell(a,b);
            if(G[a][b]){
                que.push(make_tuple(a + 1,b));
                que.push(make_tuple(a - 1,b));
                que.push(make_tuple(a,b + 1));
                que.push(make_tuple(a,b - 1));
            }
        }
    }
    cout << "No" << endl;
}