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 6 3

-----Sample Output-----
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.

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