input: from typing import List
  
  def filter_even_numbers(numbers: List[int]) -> List[int]:
      """Filters out all the even numbers from a given list.
      >>> filter_even_numbers([3, 4, 5, 6, 7])
      [4, 6]
      """
      even_numbers = []
      for num in numbers:
          if num % 2 == 0:
              even_numbers.append(num)
      return even_numbers
output:     even_numbers = []
      for num in numbers:
          if num % 2 == 0:
              even_numbers.append(num)
      return even_numbers