[Python] Can i change a string in a list by using user input in python

the code is:

max_stack_mod = 0

while True:
user_input = input()

if user_input == 'r':
max_stack_mod -= 1
max_stack = [0,] * max_stack_mod
print (max_stack)

elif user_input == 'a':
max_stack_mod += 1
max_stack = [0,] * max_stack_mod
print (max_stack)

elif user_input == 'c':
#here
user_change = input()
user_change in range

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