You are given `n` integers. Your task is very easy. You should find the maximum integer `a` and the minimum integer `b` among these `n` integers. And then you should replace both `a` and `b` with `a`-`b`. Your task will not be finished unless all the integers are equal.

Now the problem come, you want to know whether you can finish you task. And if you can finish the task, you want to know the final result.

The first line of the input contain an integer `T`(`T`≤ 20) indicates the number of test cases.

Then `T` cases come. Each case consists of two lines. The first line is an integer `n`(2≤ `n`≤ 10) as the problem described. The second line contains `n` integers, all of them are no less than -100000 and no more than 100000.

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