#include <stdio.h>
#include <string.h>

int main (void) {
    
    int n, m;
    
    scanf("%d", &n);    scanf("%d", &m);
    
    char s[n][m];
    
    for (int i = 0; i < n; i++) {
        scanf("%s", s[i]);
        if (strstr(s[i], "LOVE") != NULL)  {
            printf("YES\n");
            return 0;
        }
    }
    
    printf("NO\n");
    
    return 0;
}