// No.700 LOVE
package main

import (
	"fmt"
	"strings"
)

func main() {
	var n, m int
	fmt.Scan(&n, &m)

	var s string
	var sb strings.Builder
	for i := 0; i < n; i++ {
		fmt.Scan(&s)
		sb.WriteString(s)
	}
	if strings.Contains(sb.String(), "LOVE") {
		fmt.Println("YES")
	} else {
		fmt.Println("NO")
	}
}