n, m = io.read("*n", "*n")
io.read("*l")
found = false
for i = 1, n, 1 do
	s = io.read()
	if string.match(s, "LOVE") ~= nil then
		io.write("YES")
		found = true
		break
	end
end
if(found == false) then io.write("NO") end