How can I make a **recursive** **function** that determines whether an integer `x` is part of an integer `y`? For instance, the function will return `True` if we input `(1234, 23)` and `False` if we input `(76384, 44)`. `x` can also only be a two-digit positive number.
I already did the last condition:

```
def intCheck(y, x):
    if x < 10 or x > 99:
        return "invalid"

```

But I don't know how to do the main part of the code.