let () =
  let rec search s c =
    match s with
    | [] -> 0
    | f :: r ->
      if f = "m" then search r "i"
      else if f = "i" then if c = "i" then search r "n" else search r "m"
      else if c = "n" then if f = "-" then search r "n" else 1 + search r "m"
      else search r "m" in
  let s = read_line () in
  let lst = Str.split (Str.regexp "") s in
  Printf.printf "%d\n" (search lst "m")