LinkedList by User Input

[SantiagoPB]

Hello everyone, my name is Santiago .

I have to write a program that reads a sequence of numbers one by one and stores them in a LinkedList.

This program must meet certain conditions:

1. The input must be written by the user.

2. The last element of the input must be -1 to end the sequence (which does not belong to the linked list anymore.)

3. The inputs must be written one by one, ending with -1.

Examples:
Input: 1
3
4
7
5
6
-1
Output: 1 3 4 7 5 6

Input: -1
Output:

I have all the code already written, but I have programmed the input differently, since I do not know how to perform condition 2 and 3. If someone can help me write this last part, I would appreciate it.

Thank you very much for the help.

P.S.: There is my problem:

a_llist = LinkedList()
n = int(input('How many elements would you like to add? '))
for i in range(n):
    data = int(input('Enter data item: '))
    a_llist.append(data)
print('The linked list: ', end = '')
a_llist.display()

FULL CODE:

class Node:
    def __init__(self, data):
       self.data = data
       self.next = None
 
class LinkedList:
    def __init__(self):
        self.head = None
        self.last_node = None
 
    def append(self, data):
        if self.last_node is None:
            self.head = Node(data)
            self.last_node = self.head
        else:
            self.last_node.next = Node(data)
            self.last_node = self.last_node.next
 
    def display(self):
        current = self.head
        while current is not None:
            print(current.data, end = ' ')
            current = current.next

# There are my problem with user input:

a_llist = LinkedList()
n = int(input('How many elements would you like to add? '))
for i in range(n):
    data = int(input('Enter data item: '))
    a_llist.append(data)
print('The linked list: ', end = '')
a_llist.display()