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 (GCC 5.4.1) (judge verdict: Accepted)

#include <stdio.h>

int main(void){
	int a,b,c,m;
	scanf("%d",&a);
	scanf("%d",&b);
	
	if(a>b){
		m=a;
		a=b;
		b=m;
	}

	scanf("%d",&c);
	if(c<b){
		m=c;
		c=b;
		b=m;	
		if(a>b){
			m=a;
			a=b;
			b=m;
		}
	}

	m=0;
	m=b-a;
	m+=c-b;

	printf("%d",m);
	return 0;
}