def print_menu():
    print('\nMenu: ')
    print('1. append')
    print('2. sort')
    print('3. print')
    print('4. quit')

my_list = []
quit = False
input_line = None

while not quit:
    print_menu()

    command = int(input('\nEnter command: '))

    if command == 1:
        item = input('Item? ')
        my_list.append(item)
    elif command == 2:
        my_list.sort()
    elif command == 3:
        print(my_list)
    elif command == 4:
        quit = True