input: 
  from typing import List
  
  def my_function(a: int, b: int) -> int:
      """ Compute the GCD of two numbers using the Euclidean algorithm.
      >>> my_function(1000, 500)
      500
      >>> my_function(14, 21)
      7
      """
  
      if b == 0:
          return a
      return my_function(b, a % b)
  
output:     if b == 0:
          return a
      return my_function(b, a % b)