input: from typing import Callable
  
  
  def create_sum_function() -> Callable[[int, int], int]:
      """ Suggest a valid Python syntax to calculate the sum of two variables using lambda
      >>> sum = create_sum_function()
      >>> print(sum(3, 4))
      7
      """
      return lambda a, b: a + b
output:     return lambda a, b: a + b