import java.util.Scanner;
import java.util.Arrays;

public class Exercise001 {
  public static void main (String[] args){

    Scanner sc = new Scanner(System.in);

    int rowNum = sc.nextInt();
    int colNum = sc.nextInt();
    boolean result = false;
    for (int i = 0; i < rowNum; i++) {
      if (sc.next().indexOf("LOVE") != -1) {
        result = true;
        break;
      }
    }
    System.out.println(result ? "YES" : "NO");
  }
}