class Node:
    def __init__(self, data):
        self.data = data
        self.next = None

class my_linked_list:
    def __init__(self):
        self.head = None
        self.last_node = None

    def add_value(self, my_data):
        if self.last_node is None:
            self.head = Node(my_data)
            self.last_node = self.head
        else:
            self.last_node.next = Node(my_data)
            self.last_node = self.last_node.next

    def calculate_length(self):
        return self.length_helper_fun(self.head)

    def length_helper_fun(self, curr):
        if curr is None:
            return 0
        return 1 + self.length_helper_fun(curr.next)

my_instance = my_linked_list()
my_data = input('Enter elements of the linked list ').split()
for elem in my_data:
    my_instance.add_value(int(elem))
print('The length of the linked list is ' + str(my_instance.calculate_length()))

Enter elements of the linked list 12 45 32 67 88 0 99
The length of the linked list is 7