The input is a natural number n — the number of rows and columns in the matrix, the number of matrix elements (integers) line by line separated by a space. draw the maximum element below the main diagonal. The elements of the main diagonal are also taken into account.

def max_below_main_diagonal(n):
    max = -100
    for k in range(1,n):
        for i in range(0,n):
            for j in range(0,n):
                if (i+j) == k:
                    if A[i][j] > max:
                        max = A[i][j]
    print(max)

max_below_main_diagonal(2)