#include <bits/stdc++.h>
#ifdef _DEBUG
#include "debug.hpp"
#else
#define debug(...)
#endif
#define fastIO (cin.tie(0), cout.tie(0), ios::sync_with_stdio(false))
#define rep(i, n) for (int i = 0; i < (n); ++i)
#define precise(i) fixed << setprecision(i)
using ill = int64_t;
using ull = uint64_t;
using namespace std;

void solve() {
  int n, m;
  cin >> n >> m;

  if (m < 4) {
    cout << "NO" << '\n';
    return;
  }

  rep(_, n) {
    string line;
    cin >> line;

    for (int i = 0; i < m - 4; i++) {
      string substr = line.substr(i, 4);
      if (substr == "LOVE") {
        cout << "YES" << '\n';
        return;
      }
    }
  }
  cout << "NO" << '\n';
}

void wrapper() {
  rep(i, 3) {
    cout << "[TEST " << i + 1 << "]\n";
    solve();
    cout << "\n";
  }
}

int main() {
  fastIO;
#ifdef _DEBUG
  wrapper();
#else
  solve();
#endif
}