package main

import (
	"bufio"
	"fmt"
	"os"
)

var sc = bufio.NewScanner(os.Stdin)

func Scanner() string {
	sc.Scan()
	return sc.Text()
}
func main() {
	buf := make([]byte, 0)
	sc.Buffer(buf, 100000007)
	sc.Split(bufio.ScanWords)
	inm := 1145141919810
	s := Scanner()

	ans := inm
	for i := 0; i < len(s)-2; i++ {
		for j := i + 1; j < len(s)-1; j++ {
			for k := j + 1; k < len(s); k++ {
				if s[i] == 'c' && s[j] == 'w' && s[k] == 'w' {
					ans = min(ans, k-i+1)
				}
			}
		}
	}
	if ans == inm {
		ans = -1
	}
	fmt.Println(ans)
}

func min(x int, y int) int {
	if x >= y {
		return y
	} else {
		return x
	}
}