#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
#include <iomanip>
#include <cmath>
#include <stdio.h>
#include <queue>
#include <deque>
#include <cstdio>
#include <set>
#include <map>
#include <bitset>
#include <stack>
#include <cctype>
using namespace std;
int b[550][550] = { 0 };
int b1[4] = { 0,0,1,-1 };
int b2[4] = { 1,-1,0,0 };
int main() {
	long long n, m;
	cin >> n >> m;
	queue<pair<int, int>> que;
	que.push(make_pair(1, 1));
	b[1][1] = 1;
	while (!que.empty()) {
		int x = que.front().first, y = que.front().second;
		que.pop();
		for (int j = 0; j < 4; j++) {
			if (x + b1[j] == n && y + b2[j] == n) {
				cout << "Yes" << endl;
				return 0;
			}
			if (x + b1[j] <= 0 || x + b1[j] > n || y + b2[j] <= 0 || y + b2[j] > n)continue;
			if (b[x + b1[j]][y + b2[j]] == 0) {
				cout << x + b1[j] << " " << y + b2[j] << endl;
				string s;
				cin >> s;
				if (s == "-1") {
					return 0;
				}
				else if (s == "Black") {
				    b[x + b1[j]][y + b2[j]] = 1;
					que.push(make_pair(x + b1[j], y + b2[j]));
				}
				else {
					b[x + b1[j]][y + b2[j]] = -1;
				}
			}
		}
	}
	cout << "No" << endl;
	return 0;
}