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 PHP7 (7.0.15) (judge verdict: Accepted)

<?php

while (true) {
	$input = trim(fgets(STDIN));
	$input = explode(" ", $input);
	foreach ($input as $value) {
		$args[] = $value;
		if (count($args) >= 3) {
			break;
		}
	}
	if (count($args) >= 3) {
		break;
	}
}


$t1 = $args[0];
$t2 = $args[1];
$t3 = $args[2];

$cost12 = abs($t1 - $t2);
$cost23 = abs($t2 - $t3);
$cost31 = abs($t3 - $t1);

$cost1 = 0 + $cost12 + $cost23;
$cost2 = 0 + $cost23 + $cost31;
$cost3 = 0 + $cost31 + $cost12;



if ($cost1 < $cost2) {
	if ($cost1 < $cost3) {
		$result = $cost1;
	}else{
		$result = $cost3;
	}
}else{
	if ($cost2 < $cost3) {
		$result = $cost2;
	}else{
		$result = $cost3;
	}
}

out($result);

function out($var){
	echo $var , PHP_EOL;
}