1002. Find Common Characters

//https://leetcode.com/problems/find-common-characters/
from collections import Counter
class Solution:
    def commonChars(self, A: List[str]) -> List[str]:
        
        if not A: return []
        
        x = Counter(A[0])
        
        for items in A[1:]:
            x = x & Counter(items)
            
        return list(x.elements())