import numpy as np
a=np.array([[3,0,-2,11],[0,0,9,0],[0,7,0,0],[0,0,0,-3]])

print(a)

my_list = [[], [], [], []]
MAX_LENGTH = 4
for i in range(0, MAX_LENGTH):
    for j in range(0, MAX_LENGTH):
        n = int(input("Enter n:"))
        my_list[i].insert(j, n)
        
    print(my_list)  

print()
for i, row in enumerate(my_list):
    for j, item in enumerate(row):
        print(f'a[{i}] [{j}] = {item} ', end=' ')
    print()