Problem:
Score : 100 points

Problem Statement

You have three tasks, all of which need to be completed.

First, you can complete any one task at cost 0.

Then, just after completing the i-th task, you can complete the j-th task at cost |A_j - A_i|.

Here, |x| denotes the absolute value of x.

Find the minimum total cost required to complete all the task.

Constraints

All values in input are integers.

1 \leq A_1, A_2, A_3 \leq 100

Input

Input is given from Standard Input in the following format:

A_1 A_2 A_3

Output

Print the minimum total cost required to complete all the task.

Sample Input 1

1 6 3

Sample Output 1

5

When the tasks are completed in the following order, the total cost will be 5, which is the minimum:

Complete the first task at cost 0.

Complete the third task at cost 2.

Complete the second task at cost 3.

Sample Input 2

11 5 5

Sample Output 2

6

Sample Input 3

100 100 100

Sample Output 3

0

Solution in Go (1.6) (judge verdict: Accepted)

package main

import (
        "bufio"
        "fmt"
        "math"
        "os"
        "sort"
        "strconv"
        "strings"
)

////////////////////////////////////////
///        templates                 ///
////////////////////////////////////////

var sc = bufio.NewScanner(os.Stdin)

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

var rdr = bufio.NewReaderSize(os.Stdin, 1000000)

func readBigLine() string {
        buf := make([]byte, 0, 1000000)
        for {
                l, p, e := rdr.ReadLine()
                if e != nil {
                        panic(e)
                }
                buf = append(buf, l...)
                if !p {
                        break
                }
        }
        return string(buf)
}

func strSprit(str string) []string {
        cols := strings.Split(str, " ")
        return cols
}

func parseInt(str string) int {
        n, _ := strconv.Atoi(str)
        return n
}

func intSprit(str string) []int {
        strs := strSprit(str)
        cols := make([]int, len(strs))
        for i, v := range strs {
                cols[i] = parseInt(v)
        }
        return cols
}

type SortSlice []int

func (s SortSlice) Len() int {
        return len(s)
}

func (s SortSlice) Swap(i, j int) {
        s[i], s[j] = s[j], s[i]
}

func (s SortSlice) Less(i, j int) bool {
        return s[i] < s[j]
}

func reverseString(str string) string {
        buf := []rune(str)
        for i, j := 0, len(buf)-1; i < j; i, j = i+1, j-1 {
                buf[i], buf[j] = buf[j], buf[i]
        }
        return string(buf)
}

////////////////////////////////////////
///        end templates             ///
////////////////////////////////////////

func main() {
        line := nextLine()
        nums := intSprit(line)
        sort.Ints(nums)

        s := 0
        for i := 1; i < len(nums); i++ {
                s += int(math.Abs(float64(nums[i] - nums[i-1])))
        }
        fmt.Println(s)

}