// No.1883 SLASH
package main

import (
	"fmt"
	"sort"
	"strconv"
)

func main() {
	var s string
	fmt.Scan(&s)

	x := make([]int, 3)
	for i, v := range s {
		x[i], _ = strconv.Atoi(string(v))
	}
	sort.Ints(x)
	fmt.Println(x[2] - x[0])
}