#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < (n); ++i)
#define srep(i, s, t) for (int i = s; i < t; ++i)
#define drep(i, n) for (int i = (n)-1; i >= 0; --i)
using namespace std;
typedef long long int ll;
typedef pair<int, int> P;
#define MAX_N 200005
const int dx[4] = {-1, 0, 1, 0};
const int dy[4] = {0, -1, 0, 1};
int main() {
    int n, m;
    cin >> n >> m;
    int a[n + 2][n + 2];
    rep(i, n + 2) rep(j, n + 2) a[i][j] = 0;
    a[1][1]                             = 1;
    a[n][n]                             = 1;

    int f[n + 2][n + 2];
    rep(i, n + 2) {
        rep(j, n + 2) {
            if (i == 0 || j == 0 || i == n + 1 || j == n + 1) f[i][j] = 1;
            else
                f[i][j] = 0;
        }
    }

    f[1][1] = 1;
    queue<P> que;
    que.push(P(1, 1));
    int cnt = 0;
    while (que.size()) {
        int x = que.front().first;
        int y = que.front().second;
        que.pop();
        rep(i, 4) {
            int nx = x + dx[i];
            int ny = y + dy[i];
            if (f[nx][ny]) continue;
            f[nx][ny] = 1;
            cout << nx << ' ' << ny << endl;
            fflush(stdout);
            string s;
            cin >> s;
            cnt++;
            if (s[0] == 'B') {
                a[nx][ny] = 1;
                que.push(P(nx, ny));
            }
            if (cnt == 3000) break;
        }
        if (cnt == 3000) break;
    }

    if (a[n][n]) {
        puts("Yes");
    } else {
        puts("No");
    }
    return 0;
}