"""
You are given two non-empty linked lists that represent integers. A linked
list of 1->2->3 represents the integer 321. Write a function to sum two of
these linked lists and return the sum as a linked list. For example, given
the linked lists, 1->2->3 and 2->4->7, the sum is 3->6->0->1.

"""

class Node:

  def __init__(self, value=0, next=None):
    self.value = value
    self.next = next
    
def linked_list_sum_iterative(list1, list2):
    print('to bo continued')