Given this code, what will print(obj._Outer__Inner__val) output?

Given this code, what will print(obj._Outer__Inner__val) output?

class Outer:
    class __Inner:
        def __init__(self):
            self.__val = 99
    def __init__(self):
        self.__Inner = Outer.__Inner()
        self.__Inner.__val = 100
obj = Outer()