import java.util.Scanner;

public class Main{

	public static void main(String[] args) {
		Main main=new Main();
		main.run();
	}

	void run() {

		Scanner sc=new Scanner(System.in);

		int N=sc.nextInt();
		int M=sc.nextInt();

		String buf="";
		for(int i=0;i<N;i++) {
			buf=sc.next();

			if(buf.matches(".*LOVE.*")) {

				System.out.println("YES");
				return;
			}
		}

		System.out.println("NO");
	}
}