class Solution:
    def peopleIndexes(self, f: List[List[str]]) -> List[int]:
        res = []
        dic = collections.defaultdict(list)
        for i in range(len(f)):
            for j in f[i]:
                dic[j].append(i)
                
        for i in range(len(f)):
            L = []
            for j in f[i]:
                L.append(dic[j])
            P = set(L[0]).intersection(*L[1:])
            if len(P) == 1:
                res.append(i)
                
        return res