def fna s= a=input for c in a if cisdigit sappendc else sappend fnasd2345sd

The function fn() takes one argument 'a'. It initializes an empty list 's' and then takes input from the user and assigns it to 'a'. It then iterates over each character in 'a'. If a character is a digit, it appends that character to the list 's'. Otherwise, it appends an empty string to the list 's'.

Finally, the function is called with an argument 'asd2345sd'. It will return None since there is no return statement in the function.