input: 
  def calculate_sum_lambda(a: int, b: int) -> int:
      """Calculates the sum of two variables using a lambda function.
      >>> calculate_sum_lambda(3, 4)
      7
      >>> calculate_sum_lambda(5, 5)
      10
      """
      sum_lambda = lambda x, y: x + y
      return sum_lambda(a, b)
  
output:     sum_lambda = lambda x, y: x + y
      return sum_lambda(a, b)