package main

import (
	"fmt"
	"regexp"
)

func main() {
	var S string
	fmt.Scan(&S)
	reg := regexp.MustCompile(`c.*?w.*?w`)

	l := -1
	for _, s := range reg.FindAllString(S, -1) {
		slen := len(s)
		if slen < l || l == -1 {
			l = slen
		}
	}
	fmt.Println(l)
}