def main():
sol = Solution()
num = [1,2,1,2,3,5,5,4,4]
print sol.singleNumber(num)
def main():
sol = Solution()
nums = [1,2,1,3,2,5]
print sol.singleNumber(nums)
def main():
sol = Solution()
num = [1,2,1,2,3,5,5,4,4]
print sol.singleNumber(num)
def main():
sol = Solution()
nums = [1,2,1,3,2,5]
print sol.singleNumber(nums)