#include <iostream>
#include <algorithm>
#include <map>
#include <set>
#include <queue>
#include <stack>
#include <numeric>
#include <bitset>
#include <cmath>

static const int MOD = 1000000007;
using ll = long long;
using uint = unsigned;
using ull = unsigned long long;
using namespace std;

template<class T> constexpr T INF = ::numeric_limits<T>::max() / 32 * 15 + 208;

template <class T, class U>
vector<T> make_v(U size, const T& init){ return vector<T>(static_cast<size_t>(size), init); }

template<class... Ts, class U>
auto make_v(U size, Ts... rest) { return vector<decltype(make_v(rest...))>(static_cast<size_t>(size), make_v(rest...)); }

template<class T> void chmin(T &a, const T &b){ a = (a < b ? a : b); }
template<class T> void chmax(T &a, const T &b){ a = (a > b ? a : b); }

template <class F> struct REC {
  F f;
  REC(F &&f_) : f(std::forward<F>(f_)) {}
  template <class... Args> auto operator()(Args &&... args) const {
    return f(*this, std::forward<Args>(args)...);
  }
};

int main() {
    int n, k;
    cin >> n >> k;
    auto query = [&](int a, int b){
        cout << a+1 << " " << b+1 << endl;
        string s;
        cin >> s;
        if(s == "-1") exit(0);
        if(s == "Black") return 1;
        else return 0;
    };
    int p = 3000;
    auto dp = make_v(n, n, -1);
    dp[0][0] = dp[n-1][n-1] = 1;
    array<int, 4> dy{-1, 1, 0, 0}, dx{0, 0, -1, 1};
    REC([&](auto &&f, int x, int y) -> int {
        for (int dir = 0; dir < 4; ++dir) {
            int xx = x+dx[dir], yy = y+dy[dir];
            if(xx == n-1 && yy == n-1){
                cout << "Yes" << endl;
                exit(0);
            }
            if(p && 0 <= xx && xx < n && 0 <= yy && yy < n && !~dp[xx][yy]){
                dp[xx][yy] = query(xx, yy);
                p--;
                if(dp[xx][yy]) {
                    f(xx, yy);
                }
            }
        }
        return 0;
    })(0, 0);
    cout << "No" << endl;
    return 0;
}