#include <bits/stdc++.h>
using ll = long long;
using llu = long long unsigned;

using namespace std;

int main() {
    int n, m;
    cin >> n >> m;
    vector<string> s(n);
    for (int i=0; i<n; i++) { cin >> s[i]; }

    string result = "NO";
    for (auto sx : s) {
        size_t pos = sx.find("LOVE");
        if (pos != string::npos) { result = "YES"; break; }
    }
    cout << result << endl; return 0;
}