defmodule Main do
  def main do
    [n, _] =
      IO.read(:line)
      |> String.trim()
      |> String.split()
      |> Enum.map(&String.to_integer/1)

    1..n
    |> Enum.map(fn _ -> IO.read(:line) |> String.trim() end)
    |> solve
    |> IO.puts()
  end

  def solve(s) do
    cond do
      s |> Enum.any?(&(&1 |> String.contains?("LOVE"))) -> "YES"
      true -> "NO"
    end
  end
end