package main

import (
  "bufio"
  "fmt"
  _ "math"
  _ "math/big"
  "os"
  _ "strconv"
  _ "strings"
)

func main() {
  scanner := bufio.NewScanner(os.Stdin)
  for scanner.Scan() {
    text := scanner.Text()
    c := 0
    w := 0
    for _, ch := range text {
      if string(ch) == "c" {
        c += 1
      }
      if string(ch) == "w" {
        w += 1
      }
    }
    if c-1 > w {
      fmt.Println(w)
    } else {
      fmt.Println(c - 1)
    }
    break
  }
}