input: def Calculator(a: int, b: int) -> int:
      """Construct a class in Python which implements a method to add two numbers.
      >>> Calculator(1, 2)
      3
      >>> Calculator(5, 7)
      12
      """
      class Calculator:
          def __init__(self):
              pass
      
          def add_two_numbers(self, a, b):
              return a + b
      
      calculator = Calculator()
      result = calculator.add_two_numbers(a, b)
      return result
output:     class Calculator:
          def __init__(self):
              pass
      
          def add_two_numbers(self, a, b):
              return a + b
      
      calculator = Calculator()
      result = calculator.add_two_numbers(a, b)
      return result