#include <stdio.h>
#include <algorithm>
#include <iostream>
#include <string>
#include <vector>
#include <functional>
#include <map>
#include <iomanip>
#include <math.h> 
#include <stack>
#include <queue>
#include <bitset>
#include <cstdlib>
#include <tuple>
#include <cctype>

using namespace std;


int main() {
	int i, j, k;
	int n, m;
	vector<string>s(50);

	cin >> n >> m;

	for (i = 0; i < n; i++) {
		cin >> s[i];
	}
	

	for (i = 0; i < n; i++) {
		if (s[i].find("LOVE") != string::npos) {
			cout << "YES" << endl;
			return 0;
		}
	}

	cout << "NO" << endl;




	getchar();
	getchar();
	return 0;
}