#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;
#define FOR(i,m,n) for(int i=(m);i<(n);++i)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) (v).begin(),(v).end()
using ll = long long;
constexpr int INF = 0x3f3f3f3f;
constexpr long long LINF = 0x3f3f3f3f3f3f3f3fLL;
constexpr double EPS = 1e-8;
constexpr int MOD = 1000000007;
// constexpr int MOD = 998244353;
constexpr int dy[] = {1, 0, -1, 0}, dx[] = {0, -1, 0, 1};
constexpr int dy8[] = {1, 1, 0, -1, -1, -1, 0, 1}, dx8[] = {0, -1, -1, -1, 0, 1, 1, 1};
template <typename T, typename U> inline bool chmax(T &a, U b) { return a < b ? (a = b, true) : false; }
template <typename T, typename U> inline bool chmin(T &a, U b) { return a > b ? (a = b, true) : false; }
struct IOSetup {
  IOSetup() {
    std::cin.tie(nullptr);
    std::ios_base::sync_with_stdio(false);
    std::cout << fixed << setprecision(20);
  }
} iosetup;

bool query(int y, int x) {
  cout << y + 1 << ' ' << x + 1 << endl;
  string t; cin >> t;
  assert(t != "-1");
  return t == "Black";
}

int main() {
  int n, m; cin >> n >> m;
  vector is_black(n, vector(n, -1));
  is_black[0][0] = is_black[n - 1][n - 1] = 1;
  auto f = [&](auto &&f, int i, int j) -> void {
    if (n - 1 - i + n - 1 + j == 1) {
      cout << "Yes" << endl;
      exit(0);
    }
    if (i + 1 < n && is_black[i + 1][j] == -1) {
      is_black[i + 1][j] = query(i + 1, j);
      if (is_black[i + 1][j] == 1) f(f, i + 1, j);
    }
    if (j + 1 < n && is_black[i][j + 1] == -1) {
      is_black[i][j + 1] = query(i, j + 1);
      if (is_black[i][j + 1] == 1) f(f, i, j + 1);
    }
  };
  f(f, 0, 0);
  cout << "No" << endl;
  return 0;
}