from __future__ import *
from typing import Any
import time

class LinkedList:
    """
    Linked List class has a reference to the first node
    === Attribute ===
    _first: reference to the first node
    """
    def __init__(self) -> None:
        self._first = None

class Node:
    """
    A node class which stores value inside.
    === Attributes ===
    _value: value stored in this node
    _next: reference to the next node
    """
    def __init__(self, value: Any) -> None:
        self._value = value
        self._next = None