let solve s =
  let rec solve' idx c_num w_num =
    if idx >= String.length s then (c_num, w_num)
    else
      let next_c_num, next_w_num =
        match s.[idx] with
        | 'c' -> c_num + 1, w_num
        | 'w' -> c_num,     w_num + 1
        | _ -> failwith "hoge"
      in
      solve' (idx + 1) next_c_num next_w_num
  in
  let c_num, w_num = solve' 0 0 0 in
  min (c_num - 1) w_num

let () =
  let s = read_line () in
  solve s |> string_of_int |> print_endline