if __name__ == "__main__":
    # 5.3
    nums = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
    print(nums[-3:] + nums[:-3])

    # 5.4
    def remove_duplicates(word: str):
        return "".join(sorted(set(word), key=word.index))
    remove_duplicates("Donaudampfschiffahrtsgesellschaftsstewardess")

    # 5.5
    nums = [[1, 2, 3], [2, 1, 3], [4, 0, 1]]
    nums.sort(key=lambda x: x[1])

    # 5.6
    def get_animal_sound(animal: str) -> str:
        return {"Lion": "Growl", "Dog": "Bark", "Cat": "Meow"}.get(animal, "Not found.")