Brackets

brackets_input = input('put the brackets here: ')
stack_list = []

for c in brackets_input:
    if len(stack_list) >= 1:
        if stack_list[-1] == '(' and c == ')':
            stack_list.pop(len(stack_list)-1)
        elif stack_list[-1] == '[' and c == ']':
            stack_list.pop(len(stack_list)-1)
        elif stack_list[-1] == '{' and c == '}':
            stack_list.pop(len(stack_list)-1)
        else:
            stack_list.append(c)
    else:
        stack_list.append(c)

if len(stack_list) == 0:
    print('these brackets are correct!')
else:
    print('there is a mistake in the brackets...')