Contact List

#!/usr/local/bin/python3.7
# -*- coding: utf-8 -*import


def valid_index(i: str, lst: list):
    if len(i) == 1 and i.isdigit():
        return 0 <= int(i) < len(lst)


def check_len(lst: list, num: int):
    return len(lst) >= num


contacts = input().split(' ')

while True:
    command = input().split(' ')
    if 'Print' in command:
        break
    else:
        if 'Add' in command and check_len(command, 3):
            name = command[1]
            if name in contacts:
                if valid_index(command[2], contacts):
                    idx = int(command[2])
                    contacts.insert(idx, name)
            else:
                contacts.append(name)
        elif 'Remove' in command and check_len(command, 2):
            if valid_index(command[1], contacts):
                idx = int(command[1])
                contacts.remove(contacts[idx])
        elif 'Export' in command and check_len(command, 3):
            if valid_index(command[1], contacts):
                idx = int(command[1])
                count = int(command[2]) + idx
                start_slice = contacts[idx:]
                if count > len(start_slice):
                    print(' '.join(start_slice))
                else:
                    start_slice = contacts[idx:count]
                    print(' '.join(start_slice))

if check_len(command, 2):
    if 'Normal' in command:
        print(f"Contacts: {' '.join(contacts)}")
    elif 'Reversed' in command:
        contacts = contacts[::-1]
        print(f"Contacts: {' '.join (contacts)}")