import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Sample {
	public static void main(String[] args) throws NumberFormatException, IOException {
		BufferedReader br = new BufferedReader(
				new InputStreamReader(System.in));

		int row = Integer.parseInt(br.readLine());
		int col = Integer.parseInt(br.readLine());

		for(int i=0;i<row;i++) {
			String value = br.readLine();

			if(value.contains("LOVE")) {
				System.out.println("YES");
				return;
			}
		}

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