Answer 1

OK - it's clear now for me. I have done some reworking and added also comments.
https://code.sololearn.com/coBim3BnqVUp/?ref=app

Answer 2

Can you please give a description what the program should do with the digits in list maze? How should "maze" looks like after the program is executed? This would help us a lot. Thanks!

Answer 3

put this code at the very end of your file:

print()
count = 0
col = 5
for i in maze:
print(f'{i:2}', end = '')
count += 1
if count == col:
print()
count = 0

Answer 4

You have set 'n' to the value 0. Then you have initiated a for loop, which loops 26 times, each removing 'n' (0) from 'maze'. After 6 or 7 iterations, there are no more 0s left, so the line maze.remove(n) raises an error.