input: 
  def optimize_printing_numbers(numbers: List[int]) -> str:
      """ Optimize the given python program by modifying the approach to print the numbers in the list.
      
      >>> optimize_printing_numbers([1, 2, 3, 4, 5, 6])
      '1\n2\n3\n4\n5\n6'
      >>> optimize_printing_numbers([10, 20, 30])
      '10\n20\n30'
      """
  
output:     return '\n'.join(map(str, numbers))