input: from typing import List
  
  def find_largest_three(numbers: List[int]) -> List[int]:
      """
      Find the largest three numbers in a given list.
      >>> find_largest_three([1, 6, 3, 8, 7, 4])
      [6, 7, 8]
      """
      return sorted(numbers)[-3:]
output:     largest_three = []
      for num in numbers:
          if len(largest_three) < 3:
              largest_three.append(num)
          else:
              if num > min(largest_three):
                  largest_three.remove(min(largest_three))
                  largest_three.append(num)
      return sorted(largest_three)