#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef pair<ll,ll> P;
typedef vector<ll> VI;
typedef vector<VI> VVI;
#define REP(i,n) for(ll i=0;i<(n);i++)
#define ALL(v) v.begin(),v.end()
template<typename T> bool chmax(T &x, const T &y) {return (x<y)?(x=y,true):false;};
template<typename T> bool chmin(T &x, const T &y) {return (x>y)?(x=y,true):false;};
constexpr ll MOD=1000000007;
constexpr ll INF=2e18;

int dx[4] = { 1,0,-1,0 }, dy[4] = { 0,1,0,-1 };

int main(){
    int n, m; cin >> n >> m; m-=2;
    queue<P> q;
    q.push({0,0});
    VVI f(n,VI(n,0));
    f[0][0]=1;
    string s;
    int p=3000;
    while(!q.empty()&&p>0){
        p--;
        int x=q.front().first, y=q.front().second;
        q.pop();
        cout << x+1 << " " << y+1 << endl;
        cin >> s;
        if(s=="Black"){
            REP(k,4){
                int tx=x+dx[k];
                int ty=y+dy[k];
                if(tx<0||tx>=n||ty<0||ty>=n)
                    continue;
                if(f[tx][ty])
                    continue;
                f[tx][ty]=1;
                q.push({tx,ty});
            }
            m--;
        }
        else if(s=="-1")
            assert(0);
        if(x==n-1&&y==n-1){
            cout << "Yes" << endl;
            return 0;
        }
        else if(m==0){
            cout << "No" << endl;
            return 0;
        }
    }
    return 0;
}