#include<iostream>
#include<string>
using namespace std;
int main() {
	int n, m;
	cin >> n >> m;
	string s;
	for (int i = 0; i < n; i++) {
		cin >> s;
		for (int j = 0; j < m; j++) {
			if (s.find("LOVE") != string::npos) {
				cout << "YES" << endl;
				return 0;
			}
		}		
	}
	cout << "NO" << endl;

	return 0;
}