al.py

# Comment it before submitting
class Node:
    def __init__(self, value: str, next_item: Optional[Node] = None):
        self.value: str = value
        self.next_item: Node = next_item


def solution(node: Node, idx: int) -> Node:
    def get_node_by_index(node: Node, index) -> Node:
        ...
        return node
    ...
    return node


def test():
    node3 = Node("node3", None)
    node2 = Node("node2", node3)
    node1 = Node("node1", node2)
    node0 = Node("node0", node1)
    new_head = solution(node0, 1)
    # result is node0 -> node2 -> node3


if __name__ == '__main__':
    test()