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 C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;
using System.Collections.Generic;
using System.Linq;
class Program
{
    static void Main(string[] args)
    {
            // 入力
            string[] sInp = Console.ReadLine().Trim().Split(' ');
            List<int> lstTsk = new List<int>();
            for (int i = 0; i < sInp.Length; i++)
            { lstTsk.Add(int.Parse(sInp[i])); }

            // 解析
            int iOut = 0;
            lstTsk.Sort();
            for (int i = 1; i < lstTsk.Count; i++)
            { iOut += lstTsk[i] - lstTsk[i - 1]; }

            //出力
            Console.WriteLine("{0}", iOut.ToString());

#if DEBUG
        Console.WriteLine("続行するには何かキーを押してください．．．");
        Console.ReadKey();
#endif

    }

}