input: Write a function to find the largest three numbers in a list. If the list has fewer than three numbers, return the whole list.
  def find_largest_three(numbers):
      if len(numbers) < 3:
          return numbers
      return sorted(numbers)[-3:]
  assert find_largest_three([1, 6, 3, 8, 7, 4])==[6, 7, 8]
  assert find_largest_three([4, 2, 9])==[4, 2, 9]
  assert find_largest_three([100, 50, 25, 75, 125])==[75, 100, 125]
  assert find_largest_three([3])==[3]
output: def find_largest_three(numbers):
      if len(numbers) < 3:
          return numbers
      return sorted(numbers)[-3:]