#include<bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
using pint = pair<int, int>;
using pll = pair<ll, ll>;

int N, M;
vector<int> dx = {1, 0, -1, 0}, dy = {0, 1, 0, -1};
vector<vector<int>> grid;

bool dfs(int h, int w){
    if(h == N - 1 && w == N - 1)return true;
    for(int i = 0; i < 4; i++){
        int nh = h + dx[i], nw = w + dy[i];
        if(nh < 0 || nh > N - 1 || nw < 0 || nw > N - 1)continue;
        if(grid[nh][nw] != -1)continue;
        cout << nh + 1 << " " << nw + 1 << endl;
        string s;
        cin >> s;
        grid[nh][nw] = 1;
        if(s == "Black"){
            if(dfs(nh, nw))return true;
        }
    }
    return false;
}

int main(){
    cin >> N >> M;
    grid = vector<vector<int>>(N, vector<int>(N, -1));
    cout << (dfs(0, 0) ? "Yes": "No") << endl;
}