Almost all planets of our solar system have a moon, except for the inferior planets Mercury and Venus. Outside our solar system, no moons have been discovered yet. 

Assignment

Write a function bundle to which a dictionary must be given. This dictionary portrays moons on the planet or dwarf planet around which they turn. The function must print a new dictionary as a result, that portrays planets and dwarf planets on a collection of moons that turn around them. 

Example

>>> bundle({'Harpalyke': 'Jupiter', 'Psamathe': 'Neptune', 'Cordelia': 'Uranus', 'Cupid': 'Uranus'})
{'Neptune': {'Psamathe'}, 'Jupiter': {'Harpalyke'}, 'Uranus': {'Cordelia', 'Cupid'}}

>>> bundle({'Farbauti': 'Saturn', 'Ananke': 'Jupiter', 'Sinope': 'Jupiter', 'Kalyke': 'Jupiter'})
{'Jupiter': {'Ananke', 'Sinope', 'Kalyke'}, 'Saturn': {'Farbauti'}}

>>> bundle({'Callisto': 'Jupiter', 'Adrastea': 'Jupiter', 'Helene': 'Saturn'})
{'Jupiter': {'Callisto', 'Adrastea'}, 'Saturn': {'Helene'}}