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() {
    int a_1,a_2,a_3;
    scanf("%d",&a_1);
    scanf("%d",&a_2);
    scanf("%d",&a_3);
    if (a_1 <= a_2 && a_1 <= a_3)
        if (a_2 <= a_3) printf("%d",a_3-a_1);
        else printf("%d",a_2-a_1);
    else if(a_2 <= a_3 && a_2 <= a_1)
        if (a_1 <= a_3) printf("%d",a_3-a_2);
        else printf("%d",a_1-a_2);
    else if(a_1 <= a_2 && a_3 <= a_1 && a_3 <= a_2) printf("%d",a_2-a_3);
    else printf("%d",a_1-a_3);

   
    return 0;
}