// #define _GLIBCXX_DEBUG
#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); ++i)
int main() {
    // Input
    int n, m;
    cin >> n >> m;
    vector<string> s(n);
    rep(i, n) cin >> s[i];

    // Output
    bool ok = false;
    rep(i, n) rep(j, m) if (s[i].substr(j, 4) == "LOVE") ok = true;
    cout << (ok ? "YES" : "NO") << endl;
}