import random

mtr = []
for i in range(4):
    mtr.append([])
    for j in range(4):
        mtr[i].append(random.randint(-20,20)) #заполняем


for i in range(4):
    for j in range(4):
        print(mtr[i][j], end='\t') #выводим
    print()

mltp_ngtv = 1
for i in range(4):
    for j in range(4):
        if mtr[i][j] < 0:
            mltp_ngtv *= mtr[i][j]

print("Произведение отрицательных: ", mltp_ngtv)

max_index = [0,0]
max_element = mtr[0][0]
for i in range(4):
    for j in range(4):
        if mtr[i][j] > max_element:
            max_element = mtr[i][j]
            max_index = [i,j]

print()
print("Максимальный элемент: ", max_element)
print("Индексы максимального элемента: ", max_index)