class Solution:
    def singleNumber(self, nums: List[int]) -> List[int]:
        dic = {}
        for x in nums:
            if x in dic:
                dic[x] += 1
            else:
                dic[x] = 1
        ans = []
        for key,val in dic.items():
            if val == 1:
                ans.append(key)

        return ans