Extract Digits

Extract only digits from a string. Example: "a1b2c3" => "123"

Your task

Implement this function:

def extract_digits(s: str) -> str:

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: s.

Example

Input

'a1b2c3'

Output

'123'