func main()
	var ss: [][]char :: cui@input().split(" ")
	var n: int :: ss[0].toInt(&)
	var m: int :: ss[1].toInt(&)
	var ans: int :: 0
	for(1, n)
		var s: []char :: cui@input()
		if(s.findStr("LOVE", -1) <> -1)
			do cui@print("YES\n")
			ret
		end if
	end for
	do cui@print("NO\n")
end func