fun readStr () =
    let
        fun scan reader stream = SOME (StringCvt.splitl (not o Char.isSpace) reader (StringCvt.skipWS reader stream))
    in
        valOf (TextIO.scanStream scan TextIO.stdIn)
    end


fun findAns s =
    let
        fun skipBar nil = nil
          | skipBar (#"-" :: tl) = skipBar tl
          | skipBar l = l

        fun count nil = 0
          | count (#"m" :: #"i" :: tl) =
            1 + count (List.tl (skipBar tl))
    in
        count (String.explode s)
    end


val () =
    let
        val s = readStr ()
        val ans = findAns s
    in
        print (Int.toString ans ^ "\n")  
    end