def testLine1(self): self.assertEqual(solution("hello world"), -1)
def testLine2(self): self.assertEqual(solution("{}"), -1)
def testLine7(self): self.assertEqual(solution("{}{foo{}"), 2)
def testLine6(self): self.assertEqual(solution("}"), 0)
def testLine5(self): self.assertEqual(solution("{{{}"), 0)
def testLine4(self): self.assertEqual(solution("{{}{}}"), -1)
def testLine3(self): self.assertEqual(solution("{{{foo();}}}{}"), -1)