#include <bits/stdc++.h>
using namespace std;

int main() {
	int n, m;
	cin >> n >> m;

	vector<string> v(n);
	for (int i = 0; i < n; i++) {
		cin >> v.at(i);
		//cout << v.at(i) << endl;
	}

	int f = 0;
	for (int i = 0; i < n; i++) {
		for (int j = 0; j <= m - 4; j++) {
			char c = v.at(i).at(j);
			if (c == 'L') {
				string s = v.at(i).substr(j, 4);
				if (s == "LOVE") f = 1;
			}
		}
	}

	if (f) {
		cout << "YES" << endl;
	}
	else {
		cout << "NO" << endl;
	}
}