input: def findGCD(a: int, b: int) -> int:
      """ Finds the Greatest Common Divisor (GCD) of two numbers.
      >>> findGCD(1000, 500)
      500
      >>> findGCD(20, 15)
      5
      """
      if (b == 0):
          return a
      return findGCD(b, a % b)
      
  a = 1000
  b = 500
  print("GCD of number is: ", findGCD(a, b))
output:     if (b == 0):
          return a
      return findGCD(b, a % b)