input: Write a function to find the most popular episode from a dictionary with episode data.
  assert get_most_popular_episode({'1': {'views': 150}, '2': {'views': 200}, '3': {'views': 250}}) == '3'
  assert get_most_popular_episode({'1': {'views': 1000}, '2': {'views': 500}, '3': {'views': 1000}}) == '1'
  assert get_most_popular_episode({'1': {'views': 300}, '2': {'views': 600}, '3': {'views': 400}}) == '2'
output: def get_most_popular_episode(episodes):
      return max(episodes, key=lambda ep: (episodes[ep]['views'], -int(ep)))