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 ZETTAI(int num){
    int N;
    N=num;
    if(num<0){
        N=-N;
    }
    return N;
}
int main(){
    int A,B,C;
    scanf("%d%d%d",&A,&B,&C);
    int a,b,c;
    a=ZETTAI(A-B);
    b=ZETTAI(B-C);
    c=ZETTAI(C-A);
    int max=a;
    if(max<b)
    max=b;
    if(max<c)
    max=c;
    printf("%d",max);
    return 0;
}