addTwoNumbersLL(works)

class Node:
    def __init__(self, data):
        self.data = data
        self.next = None
class LinkedList:
    def __init__(self):
        self.head = None
    def push(self, new_data):
        new_node = Node(new_data)
        new_node.next = self.head
        self.head = new_node
    def addTwoLists(self, first, second):
        prev = None
        temp = None
        carry = 0
        while(first is not None or second is not None):
            fdata = 0 if first is None else first.data
            sdata = 0 if second is None else second.data
            Sum = carry + fdata + sdata
            carry = 1 if Sum >= 10 else 0
            Sum = Sum if Sum < 10 else Sum % 10
            temp = Node(Sum)
            if self.head is None:
                self.head = temp
            else:
                prev.next = temp
            prev = temp
            if first is not None:
                first = first.next
            if second is not None:
                second = second.next
        if carry > 0:
            temp.next = Node(carry)
    def printList(self):
        temp = self.head
        while(temp):
            print (temp.data,end=' ')
            temp = temp.next
first = LinkedList()
second = LinkedList()
first.push(1)
first.push(5)
second.push(3)
second.push(9)
second.push(7)
res = LinkedList()
res.addTwoLists(first.head, second.head)
res.printList()