Flatten Nested List

Flatten a 2D list. Example: [[1,2],[3,4],[5]] => [1,2,3,4,5]

Your task

Implement this function:

def flatten_nested_list(lst: list) -> list:

Write the function only — the arguments are read for you and the return value is printed automatically.

Arguments arrive as one Python literal per line, in this order: lst.

Example

Input

[[1, 2], [3, 4], [5]]

Output

[1, 2, 3, 4, 5]