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

int main() {
	int H; int W;
	while (~scanf("%d%d", &H, &W)) {
		bool ans = false;
		for (int i = 0; i < H; ++ i) {
			char buf[101];
			scanf("%s", buf);
			string row = buf;
			for (int j = 0; j <= W - 4; ++ j)
				ans |= row.substr(j, 4) == "LOVE";
		}
		puts(ans ? "YES" : "NO");
	}
}