package main

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

var sc = bufio.NewScanner(os.Stdin)

func nextLine() string {
	sc.Scan()
	return sc.Text()
}

func main() {
	line := nextLine()
	fmt.Println(int(math.Abs(float64((len(line) - 2) - 8))))
}