input: from typing import Callable
  
  def create_sum_lambda(a: int, b: int) -> Callable[[int, int], int]:
      """
      Create a lambda function that calculates the sum of two variables.
      >>> create_sum_lambda(3, 4)
      7
      >>> create_sum_lambda(5, 6)
      11
      """
      return lambda a, b: a + b
output:     return lambda x, y: a + b