let ``No.700 LOVE``() =

  let n, m =
    stdin.ReadLine().Split(' ')
    |> Array.map (int)
    |> fun args -> args.[0], args.[1]

  let rec loop = function
  | 0 -> if stdin.ReadLine().Contains("LOVE") then "YES" else "NO"
  | n -> if stdin.ReadLine().Contains("LOVE") then "YES" else loop (n-1)

  if m < 4
     then "NO"
     else loop n 
  |> stdout.WriteLine

  ()
``No.700 LOVE``()