Diagonal Span of a Matrix

Given an n x n matrix, your task is to compute the matrix's diagonal groups starting from the top-right corner and moving to the bottom-left corner. Elements that lie on the same diagonal should be grouped together. The order of the groups should follow the order of the diagonals starting from the top-right diagonal.

For example:

Input:
3
1 2 3
4 5 6
7 8 9
Output:
[[3], [2, 6], [1, 5, 9], [4, 8], [7]]

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Please note that the input is read from standard input and the output should be printed to standard output.

inputFormat

The input begins with an integer n (the size of the matrix). The following n lines each contain n space-separated integers representing the rows of the matrix.

Example:

3
1 2 3
4 5 6
7 8 9

outputFormat

Print a list of lists representing the grouped diagonal elements starting from the top-right to the bottom-left. The output should follow the Python list representation format.

Example:

[[3], [2, 6], [1, 5, 9], [4, 8], [7]]

## sample

3
1 2 3
4 5 6
7 8 9

[[3], [2, 6], [1, 5, 9], [4, 8], [7]]