Problem 1: Stack Operations

Implement a stack using Linked list and perform the following operations:

1. Push the elements 5, 10, and 15 into the stack.
2. Pop an element from the stack.
3. Push the element 20 onto the stack.
4. Pop an element from the stack.
5. Display the elements remaining in the stack.

Problem 2: Queue Operations

Implement a queue using Linked list and perform the following operations:

1. Enqueue elements 3, 6, and 9 into the queue.
2. Dequeue an element from the queue.
3. Enqueue the element 12 into the queue.
4. Dequeue an element from the queue.
5. Display the elements remaining in the queue.

in =========>python