Maximal Difference

Description:

Input:

The only line of the input contains a list of space-separated integers a_i (1 ≤ a_i ≤ 100) — elements of the array. The size of the array is between 2 and 10, inclusive. Note that the size of the array is not given explicitly!

Output:

Output a single integer — the largest absolute value of difference between adjacent elements of the array.

Sample Input:

2 10 4 8 6 12

Sample Output:

8

Sample Input:

3 3

Sample Output:

0