#include <iostream>
#include <queue>
#include <cassert>
using namespace std;

int N, M;
bool used[1009][1009], shirabeta[1009][1009];
int dx[4] = { 1, 0, -1, 0 };
int dy[4] = { 0, 1, 0,-1 };
queue<pair<int, int>> Q;

int main() {
	cin >> N >> M;
	used[1][1] = true; shirabeta[1][1] = true; Q.push(make_pair(1, 1));

	while (!Q.empty()) {
		int px = Q.front().first, py = Q.front().second; Q.pop();
		for (int i = 0; i < 4; i++) {
			int ex = px + dx[i], ey = py + dy[i];
			if (ex <= 0 || ex > N || ey <= 0 || ey > N) continue;
			if (shirabeta[ex][ey] == true) continue;
			cout << ex << " " << ey << endl;
			string str; cin >> str;
			if (str == "Black") { used[ex][ey] = true; Q.push(make_pair(ex, ey)); }
			assert(str != "-1");
			shirabeta[ex][ey] = true;
		}
	}

	if (used[N][N] == false) cout << "Yes" << endl;
	else cout << "No" << endl;
	return 0;
}