input: 
  def sum_with_lambda(a: int, b: int) -> int:
      """ Sum two variables using lambda and return the result.
      >>> sum_with_lambda(3, 4)
      7
      >>> sum_with_lambda(-1, 5)
      4
      """
      sum_func = lambda x, y: x + y
      return sum_func(a, b)
  
output:     sum_func = lambda x, y: x + y
      return sum_func(a, b)