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.

Input is given from Standard Input in the following format:

```
$A_1$ $A_2$ $A_3$
```

Print the minimum total cost required to complete all the task.

-   All values in input are integers.
-   $1 \leq A_1, A_2, A_3 \leq 100$

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.