input: Write a function to find the largest three numbers in a list. If the list has fewer than three elements, return all the elements in descending order.
  assert find_largest_three([1, 6, 3, 8, 7, 4])==[6, 7, 8]
  assert find_largest_three([10, 20])==[10, 20]
  assert find_largest_three([30, 40, 50, 60, 70])==[50, 60, 70]
  assert find_largest_three([1, 2, 3, 4, 5, 6, 7, 8, 9, 10])==[8, 9, 10]
  assert find_largest_three([])==[]
output: def find_largest_three(nums):
      return sorted(nums, reverse=True)[:3]