Flatten With A Comprehension

Write a function flatten(lol) that takes a nested list (a list of lists) and returns a single flat list with the elements of every inner list, in order. Use a nested list comprehension rather than explicit loops.

Example

flatten([[1, 2], [3, 4], [5]])  ->  [1, 2, 3, 4, 5]

Your task

Implement this function:

def flatten(lol: 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: lol.

Example

Input

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

Output

[1, 2, 3, 4, 5]