open System.Text.RegularExpressions
let ``No.436 ccw``() =
  let len arg (reg:Regex)  =
    match (reg.IsMatch arg) with
    | true -> reg.Matches(arg).[0].Groups.[0].Value.Length
    | false-> 0

  let s = stdin.ReadLine()
  let lenC = Regex( "^(c+)" ) |> len s 
  let lenW = Regex( "(w+)$" ) |> len s

  match lenC <= lenW with
  | true -> lenC-1
  | false-> lenW
  |> stdout.WriteLine
  ()
``No.436 ccw``()