Flatten List

Flatten a nested list one level deep. Example: [[1,2],[3,[4]],5] => [1,2,3,[4],5]

Your task

Implement this function:

def flatten(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]