The input is a natural number n — the number of rows and columns in the square matrix. Next, the elements of the matrix are entered line by line with a space. Output the maximum element excluding the area above the main diagonal.

`def find_max_exluding_main_diagonal(matrix): rows, columns = len(matrix), len(matrix[0]) max_num = matrix[0][0] for i in range(1, rows): for j in range(i): if max_num < matrix[i][j]: max_num = matrix[i][j] return max_num # Test matrix = [[1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11, 12], [13, 14, 15, 16]] find_max_exluding_main_diagonal(matrix)`