Int Object is Not Iterable

I don't know why but i'm kind of blocked with the int convertion of the string.

my code :

    def sum_numbers(text: str) -> int:
        n_sum = 0
        mot = text.split()
        for x in mot : 
            if x.isdigit():
                if not isinstance(x, int):
                    print(dir(x))
                    n_sum = sum(n_sum + int(x))
                else:
                    print(x)
                    n_sum = sum(n_sum + x)
        return n_sum

On the print of dir i see the 'iter' but it's keep showing as i try to change an int to int format.

when i remove the conversion i had the mistake : we can't add str to an int...

Any help welcome