P303412 - CF661D. Maximal Difference - SSOJ - 省实信息奥赛评测系统

Memory Limit：64 MB Time Limit：2 S

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D. Maximal Differencetime limit per test2 secondsmemory limit per test64 megabytesinputstandard inputoutputstandard output

You are given an array of integers a_i. Find the largest absolute value of difference between adjacent elements of the array max(abs(a_i - a_i + 1)).

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.

ExamplesInput

2 10 4 8 6 12

Output

Input

3 3

Output

VK Cup 2016 - Wild Card Round 1 (Unofficial Open Online Mirror) - *2100

303412: CF661D. Maximal Difference

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