input: Write a function to find the largest three numbers in a list. The function should return the three largest numbers in descending order. If the list has fewer than three elements, the function should return all the elements in descending order.
  assert find_largest_three([1, 6, 3, 8, 7, 4])==[8, 7, 6]
  assert find_largest_three([1, 6, 3])==[6, 3, 1]
  assert find_largest_three([8, 7, 4])==[8, 7, 4]
  assert find_largest_three([1])==[1]
  assert find_large
output: def find_largest_three(nums):
      return sorted(nums, reverse=True)[:3]