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++14 (GCC 5.4.1) (judge verdict: Wrong Answer)

#include <cstdio>
#include <iostream>
#include <vector>

using namespace std;

const int MAX_V = 1000;

int main()
{
  int a[3];
  cin >> a[0] >> a[1] >> a[2];
  
  int ans = abs(a[0]-a[1]);
  int a02 = abs(a[0]-a[2]);
  int a12 = abs(a[1]-a[2]);

  if(a02 < ans){
    ans=a02;
  }
  if(a12 < ans){
    ans=a12;
  }

  cout << ans;

  return 0;
}