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: Wrong Answer)

#include <stdio.h>
int main(void)
{
	int tasuku[3];
	int i, change;

	for (i = 0; i < 3; i++) {
		scanf("%d", &tasuku[i]);
	}

	for (i = 0; i < 2; i++) {
		if (tasuku[i] > tasuku[i + 1]) {
			change = tasuku[i];
			tasuku[i] = tasuku[i + 1];
			tasuku[i + 1] = change;
		}
	}

	printf("%d", tasuku[2] - tasuku[0]);
	return 0;
}