#include <stdio.h>
#include <string.h>
#include <stdbool.h>
int main(void){
	int n,m;
	scanf("%d %d",&n,&m);
    char str[n][100];
	for(int i = 0 ; i < n ; i ++){
	    scanf("%s",str[i]);
	}
    char decision[10];
    bool loveFlg = false;
	for(int i = 0 ; i < n; i++){
		for(int j = 0 ; j < 100;j++){
			if(str[i][j+4] == '\0'){
				break;
			}
			strncpy(decision, str[i]+j, 4);
			decision[4] = '\0';
			if(strcmp(decision,"LOVE") == 0){
				loveFlg = true;
				break;
			}
		}
		if(loveFlg){
			break;
		}
	}
	if(loveFlg){
		printf("YES");
	}else{
		printf("NO");
	}
}