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Add Last In Doubly Linkedlist

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1. You are given a partially written DoublyLinkedList class.
2. You are required to complete the body of addLast function. This function is supposed to add an element to the front of LinkedList. You are required to update head, tail and size as required.
3. Input and Output is managed for you. Just update the code in addLast function.

Note -> Use the code snippet and follow the algorithm discussed in question video. The judge can't 
        force you but the intention is to teach a concept. Play in spirit of the question.
Input Format 
input in managed for you.
Output Format 
output in managed for you.
Question Video
Constraints 
0 <= N <= 10^6
Sample Input 
addFirst 4
addFirst 4
addLast 5
addFirst 7
addLast 1
stop
Sample Output 
[7, 4, 4, 5, 1]


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