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: Accepted)

#include<stdio.h>
#include<math.h> 
int main()
{
	int a1,a2,a3;
	while(scanf("%d%d%d",&a1,&a2,&a3)!=EOF)
	{
		int t; 
		if(a1>a2)
		{t=a1;a1=a2;a2=t;}
		if(a1>a3)
		{t=a1;a1=a3;a3=t;}
		if(a2>a3)
		{t=a2;a2=a3;a3=t;}
		int x,y,s; 
		x=fabs(a2-a1);
		y=fabs(a3-a2);
		s=x+y;
		printf("%d\n",s);		 
	} 
}