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>
#include<math.h>

int main(){
    int A1, A2, A3;
    int S1, S2, S3;

    scanf("%d %d %d", &A1, &A2, &A3);
    S1 = abs(A1-A2) + abs(A2-A3);
    S2 = abs(A2-A3) + abs(A3-A1);
    S3 = abs(A3-A1) + abs(A1-A2);

    if(S1<S2){
        if(S1<S3){
            printf("%d", S1);
        }
    }else if(S2<S3){
        printf("%d", S2);
    }else{
        printf("%d", S3);
    }

    return 0;
}