#include "bits/stdc++.h"

using namespace std;

#define pb push_back
#define mp make_pair
constexpr int INF = 1 << 29;
constexpr int MOD = 1000000007;
typedef long long ll;
typedef unsigned long long ull;

constexpr int dx[4] = {1, 0, -1, 0};
constexpr int dy[4] = {0, 1, 0, -1};

int main() {
	int H, W;
	cin >> H >> W;
	vector<string> S(H);
	for (int i = 0; i < H; i++) {
		cin >> S[i];
	}

	for(int i = 0; i < H; i++) {
		if (S[i].find("LOVE") != string::npos) {
			cout << "YES" << endl;
			return 0;
		}
	}
	cout << "NO" << endl;
	return 0;
}