Given a square matrix of size , calculate the absolute difference between the sums of its diagonals.

**Input Format**:

The first line contains a single integer, . The next lines denote the matrix's rows, with each line containing space-separated integers describing the columns.

**Output Format**:

Print the absolute difference between the two sums of the matrix's diagonals as a single integer.

**Sample Input:**3 11 2 4 4 5 6 10 8 -12

**Sample Output:**15

What you will learn:

- get diagonals of a matrix

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