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For our last problem, we’re going to pretend that each node in a linked list holds the digit of a number. The tail node holds the most significant digit and the head node holds the least significant digit.

# 2 -> 4 -> 1 # represents the number 142 # 7 -> 1 # represents the number 17

Given two of these linked lists, write a function that returns the sum of the two numbers as a new linked list.

# 2 -> 4 -> 1 # plus # 7 -> 1 # returns # 9 -> 5 -> 1

To recap:

- write a function:
`add_two()`

. `add_two()`

takes two arguments, each an instance of`LinkedList`

.- return an instance of
`LinkedList`

which contains the sum of the input linked lists.

### Instructions

**1.**

Solve this problem and pass the tests. If you need help, check out the hint!

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