class Node:

    def __init__(self, name):
        self.parent = None
        # self.children = set()
        self.name = name
        self.orbits = -1

    def __str__(self):
        if self.parent:
            r = "( {} : {} ".format(self.name, self.parent.name)
        else:
            r = "( {} : {} ".format(self.name, "-")

        if self.orbits != -1:
            r += "@ {} ".format(self.orbits)
        r += ")"
        return r

    def set_parent(self, n):
        self.parent = n

    def get_orbits_to_root(self):
        if self.parent:
            return self.parent.get_orbits_to_root() + 1
        else:
            return 0

    __repr__ = __str__