class Item:
    _next = None

    def __init__(self, value, method_container):
        self.value = value
        self.method_container = method_container

    def __len__(self):
        item = self
        i = 1
        while True:
            if item == None:
                return i
            else:
                item = start[i].print_get_next()
                i += 1

    def __getitem__(self, n):
        item = self
        for i in range(n):
            item = item._next
        return item

    def __iter__(self):
        return self

    def __next__(self):
        item = self._next
        if item == None:
            raise StopIteration
        else:
            return item

    def insertBefore(self, other):
        return method_container.insert_before(this, other)

    def valueEquals(self, value):
        return method_container.value_equals(this, value)

    def print_get_next(self):
        print(value, end = "")
        print("\n" if _next == None else ", ", end = "")
        return _next