input: 
  from typing import Callable
  
  
  def calculate_sum_using_lambda() -> Callable[[int, int], int]:
      """Return a lambda function that calculates the sum of two integers.
      >>> calculate_sum_using_lambda()(3, 4)
      7
      >>> calculate_sum_using_lambda()(0, 0)
      0
      """
  
output:     return lambda x, y: x + y