def test_input_is_valid(self):
        self.assertFalse(input_data == '')

    def test_number_a_format(self):
        num_a = input_data.split()[0]
        is_valid = False
        if num_a[0] == '-' and num_a[1:].isdigit():
            is_valid = True
        elif num_a.isdigit():
            is_valid = True
        self.assertEqual(is_valid, True)

    def test_number_b_format(self):
        num_b = input_data.split()[0]
        is_valid = False
        if num_b[0] == '-' and num_b[1:].isdigit():
            is_valid = True
        elif num_b.isdigit():
            is_valid = True
        self.assertEqual(is_valid, True)