Alternating Elements

Return elements at even indices. Example: [10,20,30,40,50] => [10,30,50]

Your task

Implement this function:

def alternating(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

[10, 20, 30, 40, 50]

Output

[10, 30, 50]