input: def calculate_sum(a: int, b: int) -> int:
      """ Use lambda to calculate the sum of two variables.
      >>> calculate_sum(3, 4)
      7
      >>> calculate_sum(5, 5)
      10
      """
      return (lambda a, b: a + b)(a, b)
output:     return (lambda a, b: a + b)(a, b)