input: 
  from typing import List
  
  def find_smallest_number(numbers: List[int]) -> int:
      """ Find the smallest number in a given list of numbers
      >>> find_smallest_number([5, 4, 12, 17, 9])
      4
      >>> find_smallest_number([10, 2, 6, 8, 23])
      2
      """
      smallest = numbers[0]
      for num in numbers:
          if num < smallest:
              smallest = num
      return smallest
  
output:     smallest = numbers[0]
      for num in numbers:
          if num < smallest:
              smallest = num
      return smallest