import java.util.*;

public class Main {
	public static String word = "LOVE";

	public static void main(String args[]) {
		Scanner scan = new Scanner(System.in);

		int n = scan.hasNextInt() ? scan.nextInt() : -1;
		int m = scan.hasNextInt() ? scan.nextInt() : -1;
		if (n > 50 || n < 2 || m > 50 || m < 2) {
			System.out.println("入力エラー1");
			return;
		}

		String[][] str = new String[n][m];
		String ans = "NO";

		for (int i = 0; i < n; i++) {
			for (int j = 0; j < m; j++) {
				str[i][j] = scan.hasNextLine() ? scan.nextLine() : null;

				if (str[i][j] != null && str[i][j].contains(word)) {
					ans = "YES";
					break;
				}
			}
		}

		// 結果出力
		System.out.println(ans);

	}
}