#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
using namespace std;

int main() {
	int n, m;
	cin >> n >> m;
	vector<string> s(n);
	for (auto &x : s) cin >> x;
	cout << (any_of(s.begin(), s.end(), [](string x) {return x.find("LOVE") != -1; }) ? "YES" : "NO") << endl;
}