def test_equals(self): self.assertEqual(solution(''), '')
def test_equals_6(self): self.assertEqual(solution('a b c'), 'A B C')
def test_equals_5(self): self.assertEqual(solution('a b'), 'A B')
def test_equals_4(self): self.assertEqual(solution('a a'), 'A A')
def test_equals_3(self): self.assertEqual(solution('b'), 'B')
def test_equals_2(self): self.assertEqual(solution('a'), 'A')